Unique Selling Proposition.
In marketing (esp) USP is the one that decides whether you score over your competitors or not.

A term used to reference cannabis/marijuana/weed.

Acronym for United States Postal Service. A place of psychotic mailmen, evil yet pathetic individuals like Newman from Seinfeld, and old guys in really ugly, blue outfits. They say they'll mail in the snow, rain, and stuff like that but they're damn slow anyway!

Developed by Heckler & Koch(coke) of Germany. Stands for Universale Selbstlade Pistole or roughly tranlated self-loading pistol/semi-auto. Introduced in the early 1990's in the .40S&W caliber at first then the 9x19mm and finally the .45ACP. The .45 ACP model is the result of the Mark23 Model 0 which is also a .45 caliber.
There are many varients of the pistol. The tactical model in CS which is a .45
The compact series which also includes a .357 sig caliber which uses sig's bottle-necked rounds
USP Match, Expert, Elite, P8, P10, P12,
P2000, and the P2000 subcompact.

a mailing service, and not a very good one either.

A handgun chambered for .45 ACP, .40 S&W, and 9mm rounds produced by the Heckler and Koch arms company. It has many variants, including the USP Tactical, Expert, Compact, and the Mk. 23 SOCOM pistol developed for the U.S Military. The USP is a very reliable, functional, and hard hitting pistol that is used by many police, counter terror, and military units worldwide.

(v) to mail something via the United States Postal Service, a practice generally frowned upon by people under 30.