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1.
When you laugh and laugh your ass off, until you actually start to gain pleasure out of it.

background: lmao + orgasm = lmaorgasm
Timmy: Ha ha ha ha ha ha ha ha that's awesome, so awesome I can't even describe the feelings I'm going through!
Jerry: Well Timmy, that's obviously a "lmaorgasm".
by oozabooman November 30, 2004