Top Definition
I= I
C= Crack
M= My
S= Self
U= Up

im so funny, i make myself laugh. Also related to

UCMSU
U r so funny you make me laugh!
Joe complains about his day. I reply "some days you're the dog, & some days you're the fire hydrant, ICMSU"
by its reg March 05, 2009

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The Urban Dictionary Mug

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