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 3, 2005
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YAFS .....:You ain’t fucking shit.
You said you could handle it but we found out you A YAFS
by wtf is wrong with people December 16, 2020
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THE BEST PERSON EVER. You are one lucky bitch if you are dating a Yaf Yaf. He is also considered a lucky charm, as he respects and protects his companions
Is that Yaf Yaf? Damn he's hot..
by Dillydally123454321 March 2, 2023
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YAFFing, or, the act of writing You're a Fuckin' Faggot Dude or (YAFFD) is an acronym used in texting, usually when texting between two guys, that is usually a response to a male friend using an emoticon (smiley face or any other kind of face). YAFFD is intended to let the person know that you only tolerate broads who use that shit because they have vaginas and tits that they may one day expose to you.
YAFFING Example:

Steve (Texting Bill): dude, tonight we should totally go and see the new Judd Apatow movie
Bill: Sounds good. I'll call you when I get off work.
Steve: :o)
Bill: YAFFD
Steve: why'd you YAFF me?
Bill: because you sent me a gay clown face in your text. only girls who have nice big goobler tits are allowed to make those. Seeing as how you don't have the aforementioned goobler tits, I refuse to stand for your texts, as you are a faggot.

Steve: oh!

the only acceptable image for a man to draw in his texts using colons, brackets etc. is a penis. e.g. 8---)
by shiteater9000 April 14, 2010
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Dude my roommate has been pounding his muscle milk and is YAF.
by snozberries April 4, 2011
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Allen was sent home for yaffing during the management meeting.
by StLCardLuvr October 1, 2014
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"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
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