Top definition
Online acronym for "making a funny noise". Such a funny noise is usually made by cupping your hands over your mouth, putting your lips together, and blowing as if you were blowing into a trombone while opening and closing one of your hands, creating a sort of "wah-wah" effect.
Screenname1: Whatcha doin'?
Screenname2: mafn
Screenname1: Nice!
by ZachofOlympus March 30, 2008
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