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 February 18, 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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American Field Service (AFS) is the best worldwide exchange organization. Students can travel all over the world, meet people from other countries and learn new cultures. After their foreign exchange year they still can voluntary work at AFS. The organization is also known for their energizers.
People from AFS are always crazy, awesome, friendly, openminded, wonderful,... people.

AFS is one big family.
Student1: Hey, have you heard of AFS?
Student2: Yeah, AFS is awesome! And afser are wonderful people. I've heard they're doing some crazy energizers.
Student1: I want to go on an exchange with AFS. The organization is the best one worldwide.
Student2: Same here. The foreign exchange year will be the best year of my life.
by lola18 January 6, 2014
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So Korin over at Paddy’s Pub has total AFS, it’s unbelievable!
by BrggZ January 13, 2019
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Af stands for “as fuck”.
Wow he’s cute af!

That test was hard af!
by 💞💖🤪 December 1, 2018
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"As foretold." To such a degree it was foreseen in prophesy.
MACHIAVELLI: damn, check her out
NOSTRADAMUS: she thick af
by Himumu December 14, 2016
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