The Golden Gun originates from the 1974 James Bond film The Man with the Golden Gun. The film's villain, a hitman by the name of Scaramanga (played by Christopher Lee) uses the weapon to kill his targets. Scaramanga is an effective assassin, charging $1,000,000 per kill and dispatching his marks with one shot.
Multiplayer modes in many James Bond games include a Golden Gun that kills with one shot, regardless of the opponent's armor or health values. Golden Gun is also a multiplayer mode in which all attacks, including melee, kill with one hit.
Standard gun models such as the PP7 sometimes have golden variants, which share the one-hit-kill property of the Golden Gun.