A person who plays Call of Duty with a secondary in their hands and a sniper rifle on their back. These faggoty products of incest mainly hardscope throughout the match then when they realize their skills with the sniper rifle rival that of a quadriplegic infant's, they switch to their secondary. The reason for the existence of these oxygen-depleting degenerates is because they want to appear as if they can actually snipe and donning a ghillie suit achieves this.
John: Have you seen Mark quickscope in Search and Destroy? He's always filling up the killfeed.
Jack: He's not a quickscoper. He's a faggot ass snipeback.