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lmao means "laugh(ing) my Fuckin (or freakin) ass off"

omfg means "oh my fuckin(or freakin) god(or gosh)"

lmaomfg is a combination of the two, but it only has one "o" to save time.
ppl #1: hey look at this hilarious pic!

ppl #2: lmaomfg!!!!!
by a persin April 10, 2008
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