Coming from the universe of Battletech and MechWarrior, "Aff" is an abbreviation of "Affirmative," meaning "yes." Its opposite, naturally, is "Neg," short for negative.

When expecting an answer one way or another, the prefix "qui" may be added.
Gunter: "Enemy Kodiak at 2 o'clock. Should I open fire, quiaff?"
Von Helsing: "Aff. Take out his legs."
by Benny the Icepick August 31, 2007
Top Definition
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
br 1: mi frind pk u son of the bitch fuck
br 2: afffffffffff nooooo

player: Hey, would you like some free money?
br: AFF
player: ...what?
by Dr Pimp July 08, 2005
Originated from a brazilian term, which means deception or disappointment
<Playing an usual computer game someone really screws up everything>
Player: aff
by WhiteSands January 25, 2005
a brazilian slang word used when you don't like something, kind of like a sigh

uma giria brasileira (usada só no batepapos) que voce usa quando voce nao gosta de alguma coisa ...é tipo uma suspira affs
affs i have to go to school tomorrow or
she's such a slut affs

affs eu tenho que ir a escola amanha (ou)
ela é um puta affs
by jessikinha August 15, 2011
Brazilian term for disapointment, it is originated from the expression " ave maria"( holy mary) that is an expression to show surprise or discontentment.

Ave maria, short way, ave, adapted to Aff, used in sighs

The term was widely spread through the internet on online games.
E. G :
Mom: son i bought you a my little pony.

Son : aff mom, im not a girly girl
by Themarkymark March 04, 2016
as fuckingly fuck
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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