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The acronym stands for 'as fuck.'
That dinner was good AF.

Translation: That dinner was good as fuck.
by Mr McDownage October 10, 2011
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1. (common) Stands for "as fuck".
2. (photographic) Short for autofocus. Sometimes combined with other letters, e.g. when talking about camera-side, AF-S is single autofocus (only done the moment you tell it to) and AF-C is continuous autofocus (done constantly between turning it on and off).
1. Dude, calm down, you got no chill and are angry AF!
2. What are you doing, shooting wildlife shots without an AF lens? Unless the animals are tranquilized, but then there's nothing interesting in that.
by Egg F1337 September 08, 2016
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Means 'as fuck' and is used to clarify things. You can also use it as the word 'very' or 'really'. Mostly used online or in text messages.
1) I'm really tired; I'm tired af
2) I ship them so hard, I'm (shipname) af
3) He won't stop poking me, he's annoying af.
by BruhBiatchh March 11, 2015
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We already had OMG, LOL, and WTF, but 2014 brought about a new acronym that was popularized thanks to texting and online chatting. Abbreviating "as fuck" as AF has been happening for a while, but it was never actually spoken aloud as much as 2014. Some pronounce it "A Eff" and others simply "af."
"I'm hungry as fuck" =Old word
"I'm hungry AF" = New word
by John abuzi November 10, 2015
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(Antiquated meanings for millenials and previous generations):

a) as found, I.e. in the condition something was found

b) as formulated, I.e. according to the S.O.P
While to a post-millennial a.f meand something else completely, when you are performing a chemistry experiment in high school, please do it a.f definition b) and leave the classroom a.f definition a), without a mess
via giphy
by sexydimma February 23, 2017
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