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1.
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.
by Bob welling June 13, 2008
 
2.
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.
by Jack stern June 11, 2008
 
3.
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.
by Jack stern June 11, 2008
 
4.
Fucking Sellout
eg. an individual who has reached the bottom of a curve, at a minus platform, giving him/her no options other then selling out.
F.S.O.

by Daniel Jan & Geoff Street August 10, 2008
 
5.
FSO
stands for Fucking Stressed Out.
I came home from work today and my girlfriend was was screwing the gardener FSO!!!!
by Meta4Tony November 14, 2011
 
6.
FSO
Song written by Regurgitator
FSO is cool.
by Tomtom joejoe January 28, 2009