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1.
ysf
Abbreviation for 'You Sick Fuck'.
I can't believe you dipped your balls in the pizza dough, ysf.
by Duane April 24, 2005
 
2.
YSF
You Stupid F***.
Michael, YSF, you miss the whole point.
by Rudy1957 January 28, 2009
 
3.
Your So Fucking Sexy
Damn girl YSFS
by SmexxySnarf June 29, 2011
 
4.
YSF
short for "You're So Funny"
lol that was a good joke! YSF!
by MAN (My anonymous name) February 19, 2011