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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.
by Rob Hruska February 06, 2004
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Aug 1 Word of the Day
the act of texting people while you are pooping
ex. (talking to a friend on fbook chat)

person 1: hey man whats going on tonight
person 2: i gotta go to the bathroom il poopt you

or

person 1: whatsup man what are you doing?
person 2: poopting you
by mr.poopter January 26, 2011
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2
Nickname for girls rated 9 out of 10. The word is typically used by dudes lacking self confidence, and therefore would not deserve "10's"
"Make sure you invite those NINES to the potluck tonight and bring your gamefaces"
by Nipples Gurunt December 12, 2008
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4
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
by Spock July 12, 2003
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6
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!
by John Dixon January 13, 2004
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