crack up 

Something very funny.
When talkin' bout Coke.

"Hahaha, whatta crack up!"
"Yo, Crack up, foo'."

crack up by Diego September 4, 2003

Crack up 

Used by stoners when they find something funny, usually said with no emotion.

Vanessa: Did you hear about what happened to Todd?
Ben: Crack up.

Crack up by Ark T May 27, 2010

Crack up 

To burst into loud, hysterical or aggressive verbal abuse. Used primarily in Ireland and the UK. Similar with the American "freak the fuck out," however only used in negative situations.

"Yer wan at the pub cracked up at me when I asked how much she charged for an hour."

"Don't you dare crack up at me! I'm not the one sleepin' with my sister!"

Crack up by Lolitaslut May 6, 2009

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.

crack up by seymour heines February 28, 2008

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!

crack-up artist by Gus McLeary April 1, 2008

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!

crack me up by golden weirdo July 20, 2008

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.

crack myself up by Jordija March 25, 2004