An acrononym for 'Falling Off My Chair Rolling On Floor Laughing My Arse Off' For occasions when your laughing so much you cannot express.
Person 1: Why did the chicken cross the road?
Person 2: I don't know, why?
Person 1: To get to the other side!
Person 2: OMG! FOMCROFLMAO!!
by Minimitchisawesome June 7, 2010
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