Top Definition
lmfaon is a term used in instant messanger to express hilarity
L-laugh M- my F- fuckin A- ass O- off N- nigga

shandball806: nd then i ran into the wall and fell on my ass
plbm11704: lmfaon
shandball806: yeh nd now my ballz nd my knee hurt..i shouldn't have drank so much "lemonade"
plbm11704: hahaha lmfaon ;)

(these are real ppl's sn's im them sometime :) )
by gonex3away July 05, 2006
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