MEANING: noun: Something that serves as incriminating evidence, especially of a crime.

ETYMOLOGY: From the idea that someone holding a recently fired gun that still has the smoke coming out of the barrel would make for incontrovertible evidence that they were the one who shot the victim. Earliest documented use: 1970s.

SMOKING GYN - you're my doctor, she said; you should know better

I'M OK-ING GUN - Here's your license to carry

AMOK-ING GUN - fires a psychosis-inducing drug instead of a tranquilizer

SUMO KING GUN - even big wrestlers sometimes have to defend themselves