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Bursting into a prolonged fit of intense, uncontrollable laughter. Instigating this sort of reaction in someone is called "Cracking that person up."
John told me a hilarious joke the other day and I started cracking up.
by lollylollylollyPOP!!! July 24, 2009
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laughing mad hard. Almost to the point of crying. Laughing you split ends off. more than giggleing or laughing
Guy 1: hey, whats wrong wiff aly?

Guy 2: Oh we where talking about how disgusting Michelle's nose is and then she started cracking up
by Petrusha July 1, 2008
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when you cracking up it means you laughing so hard at stupid and retarded shit people say or be doing....and most of the time people is hating you so badly and want to sabotage everything you do and be so evil to you because you so far out their league they cant stand it. and do everything to bring you down and always end up in prison forever or dead the worst way possible like being burn alive.
im cracking up
by Megasus Thirst Jesus Christ April 22, 2022
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cracking me up

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by bradk October 1, 2013
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crackin up

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Laughing ya ass off, synonim to rolling on the floor laughing
-Yo check out the jokes in that mag!
-They're off the hook i'm already crackin up
by Muscu May 17, 2006
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Crackin myself up

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Means when, you say a joke so funny that even you have to laugh, even if you are the only one. Though it's kinda lame laughing with yourself, but, you just cant help yourself :)
haha, knock knock, whos there? boo..boo who?
ohh dont cry its only a joke...HAHAHA

ohh i love crackin myself up
by LBK:) June 24, 2009
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