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Stands for Universal Selbstlade Pistole. Introduced by Germany in the 1990's. This pistol is famous for its unique look, firing sound, and reload style. It has also been featured many times in the Call of Duty franchise.
I wiped out my USP .45 and owned that guy's butt.......
USP .45 by MW2 Freak January 8, 2011
Related Words
45 456 455 454 .45 45 degree 450 45/47 451 45683968

Colt .45 

nigga put down that 40 and pick up some hen!
Colt .45 by MrGrinch August 7, 2003

October 45 

A day when Jesus was actually born
Billy: do you know when Jesus was born
Bob: yea on Christmas

Billy: no OCTOBER 45
October 45 by Alpha Kenny Juan October 25, 2019

Forum 45 

bunch of no-talent faggots who play emo & suck each other off.
Forum 45 by Slayer_666 April 2, 2004
my favorite little cannon that fits in my belt.

Model 1911 colt pistol
Man that is one dumbass. I would be doing the world a favor if I just pop a cao in his ass.
colt 45 by Anonymous April 4, 2003
Generally accepted as the time that all rappers come alive on Twitter. Between 11pm and 3am is a prime time to view tweets, vines and instagrams by rappers and hip hop artists. It is said "11:45" because to say p.m. would imply that there would be another option in the a.m. Rappers are never awake at 11:45am. Maybe on another planet, but not on this one.
Yo, peep the hot chick in this tequila pic that Diddy just tweeted out?

11:45. 'Bout to get lit up in this Twitter.

Snoop got his Beast Mode hat on.
It's simple. 11:45, bro.

Twitter deuces. Europe, Africa, Middle East, India, the whole world is waking up. And rappers. Rappers are awake at the same time as people on the other side of the world.
Must be 11:45.
11:45 by mimistrut January 31, 2015