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1.
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
19 5
 
2.
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
3 3