nine 

Not the definition of the "girth" of the barrel, but rather it's bore - the width of the hole that goes through the barrel. Also, not coincidentally, the diameter of the bullet - 9mm.

Refers to a pistol, usually a semi-automatic, ostensibly a 9mm.

Aside: The U.S. Army's standard pistol is a 9mm semi-automatic.

"I was about to pull out my nine and bust a cap."

nine by Rob Hruska February 6, 2004

Nine 

A firearm, usually a semi-automatic pistol, chambered for the 9x19mm parabellum cartridge.

Glock 17, Glock 18, Glock 19, Beretta 92F, FN Browning Hi-Power

Nine by Spock July 12, 2003

nine 

A 9mm handgun

i shot him twice with my nine

nine by Anonymous March 23, 2003

nine 

A semi-automatic handgun designed to fire cartridges in caliber 9mm Parabellum, aka: 9mm Luger, 9x19 NATO.

Dawgz ain't want'n nun o' mee, cuz muh nine'z got muh back!

nine by John Dixon January 13, 2004

nine 

a nine millimeter gun

Ill Pop Your Top Off With The Nine.

nine by DeVonTheDucer July 28, 2003

Nine 

Universally recognised as the best number in the world, used to express something or someone's brilliance, but can also be used to describe a complete twat

Paul and I went to Paris last week, the Eiffel tower is a massive 9 in real life.

FFS have you seen that guy Mac over there trying to be cool with his balding head, he's such a massive fucking nine.

Nine by TomGood March 29, 2015

nine 

n. used by punk ass gangstas, means a 9mm pistol, (one would be smart to run ones ass off when hearing this word being used by such types)

Best watch out fo' i whip out my niiine, an' BUST a cap

nine by Paddy C August 20, 2003