Top Definition
When something incredibly funny happens and you dont know who it was or what caused this hilarious event to occur, you say it was the 'LmaoPhantom'
Person 1: Who left this used condom in my Geography book?
Person 2: It must have been the 'LMAOPHANTOM'
Person 1: ROFLCOPTER!
by Mitchazz December 13, 2009
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