LMFAO is an acronym, abbreviation or slang word which stands for "Laughing My F***ing Ass Off"
LMFAO is an American electro pop duo consisting of rappers, producers, dancers, and DJs Redfoo and his nephew SkyBlu.
"Did you watch the LMFAO perform on stage?"
"I got an F on my test" I then said to the teacher "LMFAO!" (In this case L stands for Laugh not Laughing)
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