A term used by brazillians in online games, most often in Tibia pretty much whenever they encounter any slight misfortune, and sometimes for no reason at all. Generally aff is a br's best friend. they spam it whenever they feel like it
Example: br 1: mi frind pk u son of the bitch fuck
br 2: afffffffffff nooooo
player: Hey, would you like some free money?
Short for "affirmative" and use much like "yes" or "indeed". This primarily from the Battletech universe (and the Mech Warrior games) where Clanners use it. It's still used by fans, though use is dying out.
Example: Commander> You will defeat that freebirth scum, qui nec?
Pilot> Aff, Commands, aff.
The opposite of clean on it! This term applies to someone who has been drinking alcohol for quite some time and has eventually stopped.
Again, possibly originating in Larne, Northern Ireland, it ultimately applies when someone ISN'T drinking alcohol!