1 definition by caitlynrocksurlife

Top Definition
short for My Ass Just Fell Off.
it means something is so funny that you laughed your ass right off.
can be used instead of LOL, LMAO, ROFL, ect.
i totally created it
bobby: theres a party today
cindy: where?
bobby: in my pants
cindy: MAJFO!
by caitlynrocksurlife October 07, 2006

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