When you beat your dick off inside your pants for awhile until you are about to explode. At the point of blowing your load, you whip out your dick (your primary weapon) and proceed to dispense your white, translucent warm ammo on your victim!

To check out an attractive person without them catching you doing it.

The act of using mouthwash to freshen breath; usually used to cover up smoking or consuming alcohol.

When a sniper rifle is unzoomed and you zoom in the same time you kill someone... used in video games like Cs

It was first used in PC games such as CS you console faggot.

A Quick scope was born from the Call Of Duty and Halo franchises. The idea is to pull in your scope and shoot at the moment you see your crosshairs. this can be useful in combat because a skilled player may be able to pull this off and get accurate, one-shot kills. This is normally for show and is not the best way to play unless you want to impress others by making videos or compilations. Machinima.com is a great place to find these montages and skill in Quickscoping.