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A form of "rolling on the floor laughing", except used in an arcane way, as a ways of the person laughing knowing something the person being laughed at, doesn't. (Made Famous by Sandy Mehglich of the "You Suck at Photoshop" Series)
Doris stood, puzzled, when Richard roflcon'd because knew that no one would ask her to prom.
by The X-man September 08, 2008