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Fit As Fuck.

This acronym for the term was coined in Essex, England, and since then has been frequenly used by the whole teenage age group, especially those in the Alternative music scene. It can quite commonly be found on Myspace, a popular internet socialising website.

Please note: F.A.F. has a dot after the second F to add emphasis. The conventional F.A.F is more widely used. The extra dot may also added to avoid the certain 'chaviness' surrounding the more common form.

It also quite acceptable to use F.A.F. in normal speach.
Picture Comment:

F.A.F. You have preety eyes dear.

Spoken English:

Richard: Qwoar, that new Art teacher is preety tastey yeah?
Ross: She's F.A.F. mate. Better get better at painting!
by Fabien Dumort July 05, 2007
Fresh as Fuck.
Dude. That shit is FAF. Fresh. As. Fuck.
by JSw0le August 29, 2012
Fucked as fuck. When something is so fucked that you shit your pants.
John:Yo have you seen Annabelle yet?
Greg:Nah man, that shit is faf.
by ParkMyCow October 14, 2014
This basically means Fake Ass Friend. You know like Fake, like a bitch who always talks behind yo homies back? yeah, but this is a friend that is a bitch for talking behind yo back. it doesn't have to be a bad thing behind your back, it could be like talking to a friend that they have that hasn't been introduced to you or talking to your friend and they don't even tell you that they are talking to your friend. that is a FAF. a fake ass friend doing something you don't want them to be doin.
Girl: Hey did you hear that david went to the mall with emily?
boy: and didn't invite us?!?!?
Girl: yeah she's a total bitch hoe FAF for not inviting us.
by fricken cool dude January 07, 2014
Fake ass friend
Damn, you keep missing my calls. Stop being a FAF
by JoeyCGetatME December 20, 2013
Acronym for Fatal Anime Fantard Syndrome.

Symptoms may include
1. Obsession over said Anime.
2. Continuance of Poorly (or well done) fan art of said Anime
3. Cosplay of cast from said Anime.
4. Annoyance of anyone within 10 feet of the infected individual.

If cured from FAFS the victim may suffer from
1. Loss of friends.
2. Loss or gain of weight.
3. Loss of Charisma.
4. Unfunctioning member of society.

Anime that may spread FAFS
1. Inu-Yasha
2. Full Metal Alchemist
3. Gravitation
1. Eww, Peter, don't touch that man he has FAFS.

2. I heared when Sally saw Inu-Yasha, she was rejected from her closest friends because they wanted to stay clear of FAFS.

3. "Remember kids. Don't date people with FAFS."
by Hultsimer April 09, 2006
Fuck and forget.
HIQI with a hint of amnesia.
"Dude look"
"Meh, so many that look like her in Florida & DC, let alone Cali, FAF that."
by HaYouKnowItsTrue August 01, 2014