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.
This is when you are eating out a womans vagina untill her fluids fill up your mouth. then without swallowing the secretion, spit it all out into her rectum. then begin having anal sex with her.
Dude, last night i ended up giving my girlfriend '' The Gun Show''
mythbusters tested a myth where a man can get shot in the right place and the bullet can go right through him and into a lady on board near by and start the baby making process