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Short for Oh My Fucking God, Rolling On The Floor Laughing My Ass Off. Usually used to shorten for instant message, text or to post on a forum.
Tiffany_69: OMG, last night at the bar, Jim and Eric got into a fight over this chick, and then they actually whipped out their things and had a dong measuring contest!

MaryJane32: OMFGROTFLMAO!!!
by Boobs McKenzie April 16, 2008
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