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1.
An acronym for "You're a Fucking Slut."
Originally derived from "You're a fucking shithead" it has gone through several stages of evolution to reach its classy status. Typically it is used in good fun both on the internet and in real time conversation. You may note how the smooth syllables roll of of the tongue. YAFS can also be used to cause emotional devastation as well. Its dedicated to all those deserving of this title.

1.) "You're a Fucking Slut"
2.) "You're a Fucking Shithead"
3.) go away
4.) hello
5.) Someone who is a fucking slut.
6.) Someone who is a slut in the act of fucking.
1.) You just fucked that hoebag, YAFS!"
2.) YAFS!!! STOP EATING MY STROMBOLLI
3.) Yafs, Charizard is so the best.
4.) Yafs, thats why I fucked you.
5.) Yafs, someone needs to ram a flaming iron spike of acid in your anal cavity you goddamn slut.
6.) You got domed by whats her face, that yafs.
7.) You just got picked up by some yafs... wait thats your mom.
8.) YAFS MOM!!!!!
by Mertz and Flip March 03, 2005
 
2.
YAF
Yoked As Fuck
Dude my roommate has been pounding his muscle milk and is YAF.
by snozberries April 03, 2011
 
3.
YAF
"You're a Fuck"- Online Chatting Expression, much like STFU, that denounces a person as stupid, tool-like, idiotic..........basically a fuck. Common substitutions include You're a Fruit, You're a Fool, and other PG-13 language. "Yo" is commonly added to the front of the expression, leading to "Yo You're a Fuck", or YYAF.
Person: Hahah your mother's a whore.
You: YAF you friggin tool.
by browwwnman November 18, 2009
 
4.
YAF
Telling someone that they are a faggot.
It is popular to use on the internet but some say it face to face. An example would be calling your friend a YAF for example....
WOW Max YAF
by yoyme December 01, 2010
 
5.
yaf
Acronym for the saying: You're A Fag
Tommy: Hey you, come lick my balls.
Ralph: GMF, yaf.

*also see GMF for meaning.
by Jarulez April 16, 2005
 
6.
YAF
Yet Another Forum
Yo dude, YAF has like no features, but it's free
by bigggordonlips May 26, 2010
 
7.
yaf
A migrant farm worker who is less than 5'2" tall.
Go down to Four Mile Run and pick up some yafs - we've got harvesting to do.
by toasterhead January 04, 2004