s.f. 

sexually frustrated. in desperate need of nookie. WAY past the point of being horny.

"omgggggg, i haven't gotten any in TWO MONTHS i am SOOOO s.f."

s.f. by KELSCULLHAAAI January 21, 2009

S/f 

A shorthand salutation used usually to end emails written by United States Marines. Stands for Semper Fidelis (Always Faithful) the USMC motto.

Jones,

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

S/f, Baker

S/f by effshews April 24, 2014

S&F 

Sucking and F*cking.

I was doin' a little S&F last night with my boyfriend, man my @ss hurts!

S&F by masteriwi May 14, 2011

S&F 

Suck & Fuck - used to describe a hot session of sex

Lets do a S&F tonight

S&F by Mike in Vancouver August 10, 2006

S&F 

"Starred and Flagged" - a term used on some forums including ATS (abovetopsecret) to denote an important thread which gets moved up to the top of the list.

This post is such a great find! S&F

S&F by Surferess September 22, 2012

S & F 

smoke and fuck
smoking weed and then proceeding to have sex

*THC intensifies orgasms and sexual pleasure

My girl and I love to S & F when we have free time on the weekends.

S & F by TgangorD November 21, 2010

S&F 

"Shits & Farts"

Continuously saying shits and farts to annoy your fiancé by using the S&F to make someone's day bad.

S&F

"Shits, and Farts. Farts and Shits." repeatedly

S&F by BuBraq4# December 25, 2015