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1 definition by Doomdooer

An Extension of the standard ROFL. This literally means: Rolling On The Floor Laughing My Frikin Butt Off. While the speaker isn't always actually laughing, on the floor, or lacking his rear end, this is a good expression used to denote humor in another's words.
1st guy: Dude! I love Waffles!
2nd guy: ROTFLMFBO!
1st guy: yeah!! funneh!
by Doomdooer September 12, 2006
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