45

1) a firearm chambered for the .45 ACP cartridge (usually a large frame semi-automatic) or the ammunition for same.
2) phonograph record or player with 45 RPM spindle speed.
3) (archaic) a firearm chambered for the .45 Colt cartridge (commonly a single-action revolver, as seen in western movies)

by Aantgray February 13, 2003

45

A back handed slap in the face using 4 fingers followed by an open handed 5 finger slap in the opposite direction.

Dude you're pissing me off! Shut up before I 45 ya!

by Sambiase March 29, 2015

45

1) A Crazy Person (Derived from police code)

2) A Hooligan

Requesting backup, there is a 45 at the playground threatening people

Look at that 45 vapeing over there

by Szechuan October 13, 2017

45 it

Pull out of a curbed driveway with a 45 degree angle so as to not hit the front bumper on the sidewalk.

Dude! You'd better 45 it or else your bumper's gonna get some major pwnage.

by that cool guy who knows everything September 6, 2007

45

.45 is the caliber, in inches, not mm. a 45mm gun is fucking huge.

Whoever thought a .45 is a 45mm is a moron.

by Anonymous February 11, 2003

The 45

Verb describing the action of "grabbing her by the pussy" at a 45 degree angle in honor of our 45 president trump himself

Bro go give her the 45 and shell definitely come home with you!

by Tuna584 March 30, 2019

.45

1: A .45 caliber Firearm, usually a handgun.

2: A song written by Shinedown, with arguable many meanings but most certainly not about a breakup. many believe the song is about conformity and the dangers and sorrow of our shallow society.

"Yo nigga i bust you with my .45"

"send away for a priceless gift, one not suttle, one not o nt he list..."

by Pumba December 18, 2004