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Stands for: "Laugh my fucking ass of rolling on the floor laughing." You add the 'COPTER' just because it beats lollerblading etc.
Person 1: Whoa, that chick looks like she ate the world fattest man!
Person 2: LMFAOROFLCOPTER!!
by LMFAOROFLCOPTER Driva! March 02, 2011
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