Definition & Meaning of "quickscope"in English

What does "quickscope" mean in gaming slang?

It is used to describe a fast kill made with a sniper rifle immediately after scoping in, where the player barely aims before firing, often hitting the target mid motion. Players typically celebrate a quickscope as a flashy and skillful move, while opponents may call it cheap or unrealistic. The term originated in first person shooter communities during the mid 2000s, especially within "Call of Duty" multiplayer, where snipers developed the technique to stay mobile and aggressive instead of holding still for long aim down sights.