Wiktionary
a. (context idiomatic English) Characterized by rapid response, as to a verbal remark or to a new situation; quick to act.
Wikipedia
Quick on the Draw was an American game show that aired on the now-defunct DuMont Television Network.
Usage examples of "quick on the draw".
Wal, if a man can stand the loneliness, an' if he's quick on the draw, mebbe lone-wolfin' it is the best.
The old man sheathed the sword in one smooth, competent gesture, and Rudy found himself thinking that whoever this was, he must be very quick on the draw with that thing.
The court system has gotten rather quick on the draw the last few years.
His eyes had the sureness of a gunman so quick on the draw, he believed he had no equal.
A bullet in the brisket, only I was too quick on the draw for him.
They were quick on the draw and began shooting the instant they hit the roof.