What is the meaning of the title "The Naked Gun" in the series of detective-spoof movies starring Leslie Nielsen? Is it a joke based on an existing detective movie with a similar name? Or perhaps a play on a phrase like "the naked eye"?
The Naked Gun is a fabricated title designed to evoke the old police thrillers of yesteryear.
The film is an offshoot of a short-running TV series, Police Squad!, which starred Leslie Nielson in the same role and which itself is a pastiche on an older series from the 50s called M Squad - even going so far as to emulate the theme tune and keep the main character's christian name.
The title might also be an homage to Naked City, another TV show from the 50s and 60s that dealt with the day to day lives of homicide detectives in New York's 65th Precinct.
A Naked Gun is a gun attached to a cowboy's belt for a quick draw- it's not in a holster, it's attached via a slide mechanism and appears "naked" outside a holster. No idea if it was really used in the old west or just in books, movies and TV shows in the 1950s-60s.