rotmfflmao means 'rolling on the floor laughing my mother fucking ass off'. It's an extended version of rotfl, which is 'rolling on the floor laughing'. First used by a short 8th grader on AIM on March 8, 2007, at 04:34:14 PM.
"Dude, you know Kate?"
"Yeah, the slut?"
"rotmfflmao"
"What the fuck does 'rotmfflmao' mean?"
"Look it up, douche!"
"Yeah, the slut?"
"rotmfflmao"
"What the fuck does 'rotmfflmao' mean?"
"Look it up, douche!"
by Ben Ehrman December 14, 2008
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