Definitions by Jack stern

fsos 

An acronym for "Fat sack of shit", commonly used to insult people over the internet for being fat in real life.

Stfu you fsos go loose some weight.

fsos by Jack stern June 12, 2008

fsos 

An acronym for "Fat sack of shit", commonly used to insult people over the internet for being fat in real life.

Stfu you fsos go loose some weight.

fsos by Jack stern June 11, 2008