S Or F Edit Meaning

1.

It means Suck or Fuck, referring to sex, of course.

S or F means suck (oral) or fuck (...yeah)

See have sex, fuck, fucking, suck, sucking

2.

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.

See messing around, fooling around