To wash yourself with a flannel starting with your Face, then Armpits and lastly Fanny.
Gf: I can’t be arsed to shower I’m going to have a faf.
Bf: Ok bruh
by Mark Succerberg January 11, 2019
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Somebody who has a large body mass for their frame (fat as fuck)
Wow she's FAF

Damn, he's faffy
by Eden333 July 4, 2020
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Becky won’t go to the bars with me at 1am on a Wednesday she’s a FAF
by Lo_Litty September 1, 2019
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1. Fat As Fuck is what i've always used it as, however, apparently it can also stand for:
2. Fit As Fuck
Shit, that girl is faf!
by Maxx69 February 10, 2008
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