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rude slang An initialism of "rolling on the floor laughing my fucking ass off," used in text messages and online communications to indicate that one thinks that something is extremely funny or ridiculous. Often spelled in lowercase letters. I swear, this comedian is so effing funny. I'm sitting here roflmfao! You gotta see this video—it's a monkey riding on the back of a pig! ROFLMFAO
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.