Top Definition
A verb, usually meaning "I crack myself up."
Paige:"morgan, I created a new word! Try and guess what icmu means!"

Morgan: "well, im glad you created an acronym for i crack myself up. (:"
by mangoooooooooooooooooooo! July 06, 2011
usually said in the presence of noone but oneself

the acronym for "I Crack Myself Up".

To partake in entertainment of one's
own dumb-assedness.

The expression of one's own humor when no one is around.
"thats one fat bitch, ICMU! man, ICMU!"

by Cristhian July 06, 2008
I crack myself up.
Guy: Dude, I can't believe you said that!!!! Hilarious!!!
Dude: I know. ICMU.
by cvbella October 05, 2011

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