An acronym for "Fat sack of shit", commonly used to insult people over the internet for being fat in real life.
by Bob welling June 13, 2008
Get the fsos mug.An acronym for "Fat sack of shit", commonly used to insult people over the internet for being fat in real life.
by Jack stern June 12, 2008
Get the fsos mug.An acronym for "Fat sack of shit", commonly used to insult people over the internet for being fat in real life.
by Jack stern June 11, 2008
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