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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.
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