Top Definition
The facial expression found on incompetent jackasses while they are experiencing some sick sense of accomplishment after performing an act of dumbfuckery. Usually this facial expression, performed among other people, is followed by the individual getting their fucking teeth knocked out.
"Wipe that Pig In Shit Grin off your face before I knock your brains loose."
by bullusuckamuthafucka January 20, 2006
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