A 'warm gun' ins a term made famous by The Beatles and is most commonly referred to as a syringe filled with heroin.

It is also sometimes referred to the 'good feeling' you get after firing a gun.
"Happiness is a warm gun (bang bang, shoot shoot)."
by Eggman the walrus October 19, 2007
Made famous by the Beatles. It means any drug (Stringe full of heroin, Marijuana, Cocaine, LSD). Happiness is a warm gun, it means that if you're on drugs you're happy, so happiness is a warm gun. One of the best terms ever created.
I'm not happy, I think I need a bit of warm gun.
by millymilly March 09, 2011

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