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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