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1.
It means Suck or Fuck, referring to sex, of course.
S or F means suck (oral) or fuck (...yeah)
by K Moyer January 12, 2007
 
2.
-when something is wrong with an act
-when someone does something that is absolutely st00pid
sif
"sorf you would do that man"

"sorf that would happen"

"I mean sorf someone would break it like dat"
by Heik March 01, 2004
 
3.
1. A prudish way to refer to sex.
2. A word used to talk about sex when sheltering parents are afoot.
Cheerleader: "So what did you do with that guy last night?"
So-and-so: "Well...(So-and-so's parents walk in)... Just S or F.
by Used Up January 15, 2006