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!!!