Aff is the abbreviation of Actual Factual Fact.

Aff is the term used for somethig that is undeniably true.
"I've had too much to drink. AFF"

"She's got a lovely rack. AFF"
by jwbulmer January 16, 2010
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away from furcadia; used in furcadia when going afk
hey dude i'll be aff
by druid|douglas January 30, 2004
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Mary is annoying aff.

Ann: OMG! Look at him.
Karly: Sh*t! hot AFF.. he is way too hot.
by word4words February 07, 2015
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(Scots Vernacular) The removing of one's shirt or other upper body garments, most often in the event of warm weather but also often for purposes of celebration or simple antagonism.
Lt Data: "Captain, due to our proximity to this binary star, hull temperature has already reached critical levels and internal sensors indicate imminent failure in the enterprise's internal cooling system"

Captain Jean-Luc Picard "Right every c*nt, taps aff"
by I Hate The Future April 30, 2012
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Glaswegian (Scottish). Literally "tops off." Originally an expression for hot weather, hot enough to take one's shirt off. A phenomenon rarely seen in Glasgow. Now an expression describing good times being had. Often issued as an instruction.

The lesser-used opposite would be "taps oan."
Ah'm pure sweatin' buckets, man. Taps aff!
by Big McWeesmall July 24, 2012
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Short for "australian ford forums specification" which basically means very crap, or used to describe someone who has done something bad to you for no reason.
"Dude, check out my painted dash and neonz"

"OMFG...get rid of that!!! So AFF spec!"

Or:

"Dude, why would you root my girlfriend? That's AFF spec man"
by Rollin40 May 29, 2008
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