FAF

Formative as Fuck.
Yo Hector, that seminar on systems design was FAF.
by wordup_ February 24, 2017
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FAF

Check that bird out she's FAF!
by Baltic11111 May 16, 2009
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FAF = Fake Ass Fucker

when someone acts fake towards you, a two-faced ungenuine user who only talks to you if they want something
friend: 'hi sorry i can't come shopping with you today i'm ill'
hours later on facebook...

____ has uploaded the 59349439 pictures in an album 'shopping with the girls'

UGHHH YOU'RE SUCH A FAF!!!!!!
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Noun/Adjective: Fine At First; context of seeing someone from far away, thinking they're good looking, and looking at them up close ruins the previous first impression.

May be used in context of a great first impression, but finding out a horrible personality.
Girl: Oh my gosh! That guy over there is so good looking.
Girl2: I agree!
*approaching guy*
Girl: Never mind. He's a FAF kind of guy.
by WomanLee November 02, 2012
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FAF

"Funny as Fuck". You can actually say this instead of saying "LOL" in real life.
You tell so many jokes that are FAF!
by lightscameramike October 03, 2011
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FAF

dude that's FAF
by Pyro June 16, 2004
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Stands for 'Fuck and Forget', a brief sexual encounter which is purely about the sex without any feelings for the person, desire to see them again or guilt at sending them on their way once gratification has been acquired. Usually, there is only one encounter between any given set of partners. Can apply to any given encounter without regard to sexual orientation. Similar to the type of transaction one might have with a whore, only no money is exchanged. Can be used to describe someone you'd like to screw solely for the sex, but would never want to see again.
Jane walks up to Steve, wondering why Steve wont call her back after that night of hot, passionate fornication: "Bitch, you were an FAF, get over it. I've already had three since you, you're yesterday's screw. Sorry." replies Steve.
by Anal_Poke April 26, 2009
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