F.A.S.- Fuck ass shit. Generally a person who acts like a fuck ass and shits on everyhting else. Your typical rich white chedda mother fucker.Or a person that just doesnt give a shit about anything. Work any retail job and your sure to cross one.
That last customer was a real f.a.s. spent 2 hours helping him and he didn't buy anything.

Anyone that stays on there cell phone while you are trying to talk to them is a real f.a.s.
by T.M.C.C. March 13, 2008

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Top Definition
fas
fas: Funny Ass Shit

Now used in place of the bland "LOL".
<lonesoldier> I EAT BABIES FOR POWER. PREPARE YOUR BABIES TO BE EATEN!

<bvo> fas!
by Rick James March 05, 2004

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Feline Assassination Squad. A non profit organization keeping cats in check by any means necessary. F.A.S. is always on the scene when a cat is breaking the law or putting any human in danger. Cats that are dealt with by F.A.S. are usually never heard from again. F.A.S. is worldwide and always expanding seeking any individual willing to "do what needs to be done" to keep mankind safe from these cats who think they are above the law. To join please submit a resume at your nearest F.A.S. headquarters.
F.A.S. is similar to the dog catcher, but for cats
by SlothTAS July 25, 2009

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FAS
Fetal Alcohol Syndrome-caused by women drinking while pregnant. Results in having a retarted baby.
OMG, that Maddy girl was such a FAS baby today.
by FAS BABIES R TRIPY February 28, 2009

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FAS
Flat Ass Syndrome. A bad condition where a person (usually a guy) has an unnaturally flat ass and makes their pants look like potato sacks.
Person 1: HOLY FUCK. That guy has no ass!

Person 2: I know! They must have FAS.
by lovely_cupcakes October 22, 2009

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FAS
Fucking Awesome Syndrome. When someone is just so amazing that no other words can describe it, they have FAS.
Some dude at the party told me I have FAS! I've never been so happy in my life!
by Richard C. Mongler III July 25, 2009

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FAS
fight after school; what potheads do when they are high
Alice: What's up with her?

Mandy: She's just worry because she has to FAS tomorrow

Pothead #1: Hey I wanna FAS

Pothead #2: ok man let's go!
by woohoo69 May 30, 2011

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