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

the 45

when you see a chick from behind and she looks hot, and when you go closer to see her front from a 45 degree angle she still looks great but up close its a whole 'nother story. but then you're still gonna hook up with her because she has major potential frontwise.

asshole #1: dude did you see that chick?!
asshole #2: hell yea man, she had the 45!
asshole #1: i know dude, but she's still got potential though!
asshole #2: yes, i agree

by the ibanez of death September 18, 2008

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