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!"
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