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
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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
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S D F, man! That did not just happen!
by skrufi June 29, 2005
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Sorry As Fuck. Pathetic, worthless, laughable.
You've been here for 3 months and haven't even TRIED to get a job? Rent is due. That's S. A. F.
by mmmew March 5, 2010
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S M F otherwise known as Sergio Mora Fan, but to me it means Smart, Motivated, Funny. He is a man that is extremely loyal, and is know in many boxing forums, to defend the Latin Snake to the very end. Even when fans of Peter Manfredo Jr get vulgar, and make personal attacks on him, he just lets it roll off his back. He is a man that is very selective in who he befriends, but once he does, he is the best friend you could ever want. He is giving, big-hearted, helpful, kind, creative, humorous, and so much more. He is, the best part of my heart.
I believe in fate, and just when I needed it, God brought S M F into my life.
by 1crazyfan February 26, 2006
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A shorthand salutation used usually to end emails written by United States Marines. Stands for Semper Fidelis (Always Faithful) the USMC motto.

Thanks for helpin us out back here. I'll make sure Gunny knows who came through for us.

S/f, Baker
by effshews March 17, 2014
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