Typically used as an adverbial or adjectival acronym meaning, "as fuck", AF refers to a higher, more significant version of the verb. When you are "extra" tired, you are tired AF. Might also work with nouns, although grammatically might be disjointed.
by The Review Dude February 25, 2017
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The acronym stands for 'as fuck.'
Calum: I ship Luke and Michael
Luke: Yeah, I'm Muke af
by Huke_Lemmings November 8, 2015
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Jesus, did you misspell ‘as if’? As af is stupid because it’s essentially ‘as as fuck’ and that is not grammatically correct.
1. Girl1: I was typing to one of my friends and accidentally typed ‘as af’ like a moron.

2. Girl2: that’s funny as af!
Girl3: get out. Get out of my apartment. Get out now.
by Collective Reasoning October 13, 2019
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Abbreviation of "As Fuck" be sure to use an apostrophe because you'll confuse people whose initials are A.F.
Guy 1: You're sleep af

Girl 1: is that as Fuck or are you using my initials ?
Guy 1: As Fuck why would I use your initials stupid girl.
by nonewfriendsnononoo June 25, 2014
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A term that is annoyingly overused by some white kid probably named Isaac and means as fu*k
"Isaac how are you today"
"I'm lit AF"
"We get it Isaac, you're white"
"Ok AF, I'll stop AF"
by Lit midget af August 2, 2017
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af commonly refers to as ferret, and sometimes awesome fam.
This chat was lit af (as ferret )last night!
by xplotiavos August 8, 2016
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