Idioms are fun phrases that mean something different from the actual words inside them. People use them to make their speaking and writing more colorful, exciting, and full of life. In this guide, you will discover many helpful expressions that capture the feeling of being wild or crazy.
In this lesson, we’ll look at idioms for crazy that mean acting silly or losing control. Let’s get started and explore some of these helpful expressions.
Idioms for Crazy
1. Go bananas
Meaning: To become extremely excited, silly, or wild in your behavior.
For Example: The puppies went bananas when they saw the bag of treats open. / The kids went bananas when the ice cream truck finally pulled onto the street.
Other Ways to Say: Go wild / Act silly
2. Go ape
Meaning: To react with extreme excitement or a burst of wild energy.
For Example: He went ape when he found out his favorite baseball player signed his cap. / The crowd went ape as soon as the rock band stepped onto the stage.
Other Ways to Say: Go crazy / Lose control
3. Out of your mind
Meaning: To be acting completely irrational or thinking in a silly way.
For Example: Are you out of your mind trying to ride that skateboard down the huge hill? / He must be out of his mind to wear a winter coat on a hot summer day.
Other Ways to Say: Crazy / Irrational
4. Lose your marbles
Meaning: To start acting silly or losing your sense of good judgment.
For Example: When I forgot my locker combination for the third time, I felt like I was losing my marbles. / Grandpa started telling funny jokes that made us think he lost his marbles.
Other Ways to Say: Go crazy / Lose sense
5. Off the wall
Meaning: Strange, unusual, and wonderfully crazy in a fun way.
For Example: Her idea to paint the treehouse neon pink was completely off the wall. / The movie had an off the wall plot about flying penguins.
Other Ways to Say: Weird / Bizarre
6. Barking up the wrong tree
Meaning: To look for something or accuse someone in a foolish or wrong way.
For Example: If you think I took your red pencil, you are barking up the wrong tree. / The detective realized he was barking up the wrong tree.
Other Ways to Say: Mistaken / Confused
7. Bats in the belfry
Meaning: Having silly, eccentric, or strange thoughts in your head.
For Example: My neighbor wears a pirate hat while gardening, so he must have bats in the belfry. / Whenever she suggested wild ideas, her brother joked she had bats in the belfry.
Other Ways to Say: Eccentric / Silly
8. Full of beans
Meaning: Bursting with wild, crazy, and energetic behavior.
For Example: The little puppy was full of beans all morning and chased his tail. / After eating birthday cake, the children were full of beans.
Other Ways to Say: Energetic / Lively
9. Wild and woolly
Meaning: Uncontrolled, rough, and delightfully crazy in style.
For Example: The playground game turned into a wild and woolly adventure for the kids. / His hair looked wild and woolly after he woke up from a nap.
Other Ways to Say: Unruly / Wild
10. Run wild
Meaning: To grow or behave without any rules or limits.
For Example: The horses were allowed to run wild across the open green pasture. / Her imagination tended to run wild when she read adventure books.
Other Ways to Say: Be free / Uncontrolled
11. Go berserk
Meaning: To become wildly destructive, angry, or crazy in actions.
For Example: The robot toy went berserk and spun around until its battery died. / He went berserk when his video game character was deleted.
Other Ways to Say: Go wild / Rage out
12. Have a screw loose
Meaning: To act in a silly, unusual, or slightly crazy manner.
For Example: Anyone who enjoys eating plain mustard with a spoon must have a screw loose. / He talks to his pet goldfish, which makes me think he has a screw loose.
Other Ways to Say: Act weird / Silly
13. Crack up
Meaning: To laugh in a wild and uncontrollable way.
For Example: The funny joke told by the comedian made the whole audience crack up. / Watching the kitten chase a laser pointer always makes me crack up.
Other Ways to Say: Laugh hard / Burst into laughter
14. Rolling in the aisles
Meaning: Laughing so hard at something funny that you act a bit crazy.
For Example: The funny cartoon show had the kids rolling in the aisles. / Her silly costume had everyone rolling in the aisles at the party.
Other Ways to Say: Laughing uncontrollably / Highly amused
15. Beside yourself
Meaning: To be overwhelmed with wild emotions like excitement or worry.
For Example: She was beside herself with joy when she won the art prize. / He was beside herself with worry when his cat went missing.
Other Ways to Say: Overwhelmed / Distraught
16. Off your rocker
Meaning: Acting foolish, silly, or out of your mind.
For Example: You must be off your rocker if you think we can walk ten miles in this heat. / He said we should camp outside in the snow, which sounds completely off your rocker.
Other Ways to Say: Crazy / Foolish
17. Out to lunch
Meaning: Daydreaming, not paying attention, or acting a bit silly.
For Example: When the teacher called his name, he looked completely out to lunch. / My computer is acting out to lunch today and freezing every minute.
Other Ways to Say: Distracted / Spacey
18. Space cadet
Meaning: Someone who is constantly daydreaming and acting a bit silly.
For Example: I forgot my jacket again because I am such a space cadet today. / He stared out the window like a space cadet during math class.
Other Ways to Say: Daydreamer / Absent-minded
19. Head in the clouds
Meaning: Daydreaming and ignoring what is happening around you.
For Example: She walked right past her locker because her head was in the clouds. / Stop having your head in the clouds and listen to the instructions.
Other Ways to Say: Daydreaming / Unfocused
20. Loony tunes
Meaning: Acting eccentric, silly, or completely crazy.
For Example: My little brother wears a superhero cape to the grocery store because he is a bit loony tunes. / The funny ideas they came up with sounded totally loony tunes.
Other Ways to Say: Silly / Eccentric
21. Nutty as a fruitcake
Meaning: Extremely silly, eccentric, and wonderfully crazy.
For Example: The comedian’s wild jokes on stage made him seem nutty as a fruitcake. / My aunt’s pet parrot talks to the television, which is pretty nutty as a fruitcake.
Other Ways to Say: Very eccentric / Crazy
22. Mad as a hatter
Meaning: Acting completely eccentric, wild, and funny.
For Example: The magician wore mismatched socks and acted mad as a hatter on stage. / His crazy stories about talking frogs made him sound mad as a hatter.
Other Ways to Say: Very eccentric / Wildly silly
23. Wild eyed
Meaning: Looking wide-eyed and crazy with excitement or fear.
For Example: He rushed into the room wild eyed after seeing the magic trick. / The puppy looked wild eyed when the thunder started.
Other Ways to Say: Wide eyed / Excited
24. Hair-raising
Meaning: So wild, scary, or crazy that it makes your hair stand up.
For Example: The roller coaster ride had some hair-raising drops and turns. / Telling ghost stories around the campfire was a hair-raising experience.
Other Ways to Say: Terrifying / Wild
25. Paint the town red
Meaning: To go out and have a wild, loud, and crazy celebration.
For Example: The graduating seniors went out to paint the town red after final exams. / When the team won the trophy, they celebrated to paint the town red.
Other Ways to Say: Celebrate big / Party hard
26. Kick up your heels
Meaning: To celebrate in a lively, fun, and wild way.
For Example: After finishing all our homework, we kicked up our heels and played video games. / The dancers kicked up their heels during the folk music festival.
Other Ways to Say: Celebrate / Have fun
27. Let your hair down
Meaning: To relax, act silly, and stop worrying about strict rules.
For Example: Weekend camping trips are a great time to let your hair down and have fun. / The strict teacher let her hair down and sang a song at the talent show.
Other Ways to Say: Relax / Unwind
28. Whoop it up
Meaning: To celebrate noisily and wildy with friends.
For Example: The basketball team went to the pizza shop to whoop it up after winning. / We heard the neighbors whooping it up at their backyard party.
Other Ways to Say: Celebrate / Party wildly
29. Raise the roof
Meaning: To make a tremendous amount of noise and excitement.
For Example: The cheering crowd raised the roof when the home team scored. / The kids were dancing and raising the roof in the gymnasium.
Other Ways to Say: Make noise / Party loud
30. Raise Cain
Meaning: To cause a loud, wild disturbance or act rebellious.
For Example: The mischievous raccoon raised Cain in the backyard garbage cans. / Please do not raise Cain in the library where people are reading.
Other Ways to Say: Cause trouble / Act wild
31. Raising a ruckus
Meaning: Starting a loud, chaotic, and silly disturbance.
For Example: The puppies were raising a ruckus over a single tennis ball. / The children raised a ruckus when told it was time to leave the park.
Other Ways to Say: Make noise / Cause trouble
32. Monkey business
Meaning: Silly, mischievous, or slightly crazy behavior.
For Example: The teacher told the class to stop the monkey business and focus on work. / I heard giggling from the hallway and knew there was some monkey business happening.
Other Ways to Say: Mischief / Silly antics
33. Tomfoolery
Meaning: Foolish, silly, and playful behavior.
For Example: The boys spent the afternoon engaging in harmless tomfoolery in the yard. / Enough of this tomfoolery, it is time to clean up our toys.
Other Ways to Say: Silly behavior / Foolishness
34. Horseplay
Meaning: Rough, wild, and noisy physical play among kids.
For Example: The coach stopped the horseplay in the locker room before someone got hurt. / No running or rough horseplay is allowed near the swimming pool.
Other Ways to Say: Rough housing / Silly play
35. Raising hell
Meaning: Causing a loud, wild, and rebellious disturbance.
For Example: The stray dogs were running down the street raising hell. / He loved to tease his brothers and raise hell around the house.
Other Ways to Say: Cause chaos / Act wild
36. Raising a storm
Meaning: Creating a loud and chaotic commotion over something.
For Example: The fans raised a storm when the referee made a bad call. / She raised a storm when her artwork was misplaced.
Other Ways to Say: Make a fuss / Cause uproar
37. Go off the deep end
Meaning: To react in an extreme, wild, and crazy emotional way.
For Example: He tends to go off the deep end whenever his sports team loses. / Try not to go off the deep end just because dinner is running a little late.
Other Ways to Say: Overreact / Lose control
38. Flip your lid
Meaning: To lose your temper and act wildly angry or crazy.
For Example: Dad will flip his lid if he sees the muddy footprints on the kitchen floor. / When the computer crashed, she practically flipped her lid.
Other Ways to Say: Blow up / Lose temper
39. Blow a gasket
Meaning: To become extremely angry and show a sudden crazy outburst.
For Example: Coach will blow a gasket if the team misses another easy practice play. / Mom almost blew a gasket when she saw the broken window.
Other Ways to Say: Lose temper / Explode
40. Go haywire
Meaning: To stop working properly and behave in a wild, erratic way.
For Example: The old kitchen toaster went haywire and started smoking. / The classroom computer network went haywire during the morning test.
Other Ways to Say: Malfunction / Go crazy
41. Go on a bender
Meaning: To engage in a wild and excessive round of activity.
For Example: He went on a reading bender and finished three novels in one weekend. / The art club went on a painting bender to finish the mural.
Other Ways to Say: Overdo / Go wild
42. Running amok
Meaning: Running about in a wild, out-of-control, and crazy manner.
For Example: The escaped farm chickens were running amok through the vegetable garden. / Without supervision, the toddlers started running amok in the playroom.
Other Ways to Say: Out of control / Running wild
43. Raising the dead
Meaning: Making an exceptionally loud and crazy amount of noise.
For Example: The brass instruments in the band were playing so loudly they were raising the dead. / Stop making that racket, you are raising the dead!
Other Ways to Say: Make noise / Loud racket
44. Raising a riot
Meaning: Creating a massive, wild, and chaotic disturbance.
For Example: The funny puppet show had the toddlers raising a riot of giggles. / The kids were jumping on the couch and raising a riot.
Other Ways to Say: Cause chaos / Make a scene
45. Going great guns
Meaning: Moving forward at a fast, wild, and energetic pace.
For Example: Our fundraising team was going great guns and sold fifty boxes of cookies. / He started his science project early and went great guns all afternoon.
Other Ways to Say: Moving fast / Thriving
46. At a breakneck speed
Meaning: Moving so fast that it feels wild and dangerous.
For Example: The bicycle rider raced down the steep hill at a breakneck speed. / The team worked at a breakneck speed to finish the puzzle before the timer went off.
Other Ways to Say: Very fast / Wild speed
47. Like a house on fire
Meaning: Happening with great speed, energy, and wild enthusiasm.
For Example: The two new students became friends like a house on fire. / The project moved along like a house on fire once we shared our ideas.
Other Ways to Say: Very fast / Enthusiastically
48. Like greased lightning
Meaning: Moving with incredible, wild, and blinding speed.
For Example: The running back dashed across the football field like greased lightning. / When the teacher offered candy, the students moved like greased lightning.
Other Ways to Say: Super fast / Lightning quick
49. Like a bat out of hell
Meaning: Moving at an extremely fast and wild rate of speed.
For Example: The startled rabbit bolted across the yard like a bat out of hell. / When the bell rang, the kids ran out of the classroom like a bat out of hell.
Other Ways to Say: Super fast / Speeding wildly
50. Wild goose chase
Meaning: A foolish, crazy, and hopeless search for something.
For Example: Looking for my lost red crayon in the huge park felt like a wild goose chase. / Don’t send us on a wild goose chase for items we don’t need.
Other Ways to Say: Hopeless search / Silly errand
51. Off the deep end
Meaning: Doing something extreme, reckless, or crazy without thinking.
For Example: He jumped off the deep end by volunteering to bake one hundred cupcakes. / She went off the deep end when she decided to learn three languages at once.
Other Ways to Say: Go extreme / Dive in
52. On a wild ride
Meaning: Experiencing an unpredictable, exciting, and crazy adventure.
For Example: Building our first robot project turned out to be on a wild ride. / Reading that mystery novel took us on a wild ride.
Other Ways to Say: Crazy adventure / Thrilling trip
53. Spinner of yarns
Meaning: Someone who tells wild, exaggerated, and crazy stories.
For Example: Grandpa is a great spinner of yarns about his childhood fishing trips. / We knew he was just a spinner of yarns when he mentioned flying dogs.
Other Ways to Say: Storyteller / Exaggerator
54. Tall tale
Meaning: A story that is so exaggerated and crazy it cannot be true.
For Example: He told a tall tale about catching a fish as big as a boat. / The legends of early explorers are full of tall tales.
Other Ways to Say: Exaggeration / Wild story
55. Pulling your leg
Meaning: Teasing someone by telling a silly or crazy untruth.
For Example: Don’t believe him when he says school is cancelled, he is just pulling your leg. / I knew she was pulling my leg about winning the lottery.
Other Ways to Say: Teasing / Joking
56. Having me on
Meaning: Teasing someone with a funny, unbelievable story.
For Example: You can’t be serious, you must be having me on about the homework. / He tried to convince us aliens landed, but we knew he was having us on.
Other Ways to Say: Joking / Teasing
57. Pulling wool over eyes
Meaning: Tricking someone with silly, unbelievable stories or lies.
For Example: He tried pulling wool over our eyes by saying the dog ate his puzzle. / You cannot pull wool over the teacher’s eyes with that silly excuse.
Other Ways to Say: Fooling someone / Tricking
58. Riding for a fall
Meaning: Acting reckless, wild, and foolishly close to trouble.
For Example: If he keeps refusing to study for tests, he is riding for a fall. / Ignoring the safety rules on your bike is riding for a fall.
Other Ways to Say: Taking risks / Acting reckless
59. Playing with fire
Meaning: Doing something dangerous, reckless, and foolishly wild.
For Example: Copying answers on a test is playing with fire. / Teasing the guard dog is like playing with fire.
Other Ways to Say: Taking risks / Being reckless
60. Playing with dynamite
Meaning: Engaging in a very dangerous, wild, and reckless activity.
For Example: Arguing with the coach about team rules is like playing with dynamite. / Sharing secrets online without permission is playing with dynamite.
Other Ways to Say: Taking huge risks / Being dangerous
Exercise to Practice
- The puppies went ________ when they saw the bag of treats open.
- Are you ________ trying to ride that skateboard down the huge hill?
- Her idea to paint the treehouse neon pink was completely ________.
- The little puppy was ________ all morning and chased his tail.
- The funny joke told by the comedian made the whole audience ________.
- She was ________ with joy when she won the art prize.
- Weekend camping trips are a great time to ________ and have fun.
- The teacher told the class to stop the ________ and focus on work.
- The old kitchen toaster went ________ and started smoking.
- The escaped farm chickens were ________ through the vegetable garden.
- The bicycle rider raced down the steep hill at a ________ speed.
- The running back dashed across the football field like ________.
- Looking for my lost red crayon in the huge park felt like a ________.
- Don’t believe him when he says school is cancelled, he is just ________.
- If he keeps refusing to study for tests, he is ________.
Answer Key
- bananas
- out of your mind
- off the wall
- full of beans
- crack up
- beside yourself
- let your hair down
- monkey business
- haywire
- running amok
- breakneck
- greased lightning
- wild goose chase
- pulling your leg
- riding for a fall
Conclusion
Learning these idioms helps you describe wild, silly, and crazy moments in a much more colorful and entertaining way. Try using a few of these fun phrases when telling stories or talking with your friends this week.
