crack up

A female pilot flying upside down. An FAA rating obtained by female pilots after they have logged a minimum of 15 hours of inverted flight time.

Sally is a crack up. She can fly better upside down than most pilots can fly right-side up.

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cracked up

A person who is "high" on crack.

"dude i'm so cracked up right now!"

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crack-up artist

An individual who is involved in either:

1)Comedic delivery of wit in front of a small audience.

2)Regularly providing 'one-liners' with the purpose of amusement.

Anthony: Have you seen my keys Tony?

Tony the 'crack-up artist': Yes I sure have, there they are.. Not!

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crack me up

when someone says something funny and you start laughing uncontrollably you say "YOU CRACK ME UP!"

person 1: he is planning world freckelation!
person 2 who is laughing uncontrollably: dude! u crack me up!

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cracking me up

Making me laugh

You are cracking me up!

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crack myself up

to laugh hysterically at your own jokes, whether or not anyone else laughs at them.

And then the eagle says, "That's not MY nest!"...sigh. I crack myself up.

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crack someone up

to make someone laugh(see also crack up.)

"Your foolishness just cracks me up."

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