Gunnery Sergeant Hartman's description of a promiscuous
girl, one that may or may not be a soldier's girlfriend prior to his military
service. The term originated in the 1987 movie FULL METAL
JACKET, and was used to describe the difference between a Springfield M-14 rifle used during basic training, and a female human, to the Marines being trained.
Gunnery Sergeant Hartman's dialog during
FULL METAL JACKET (1987):
(Shouting): "Tonight, you pukes
will sleep with your rifles. You will give your rifle a girl's name. Because this is the only pussy you people
to get. Your days of finger-banging old MARY
JANE ROTTEN CROTCH through
her pretty pink panties are over. You're married to this piece, this weapon of iron and wood. And you will be faithful."