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U-ndercover P-artyer Someone who is quiet most the time usually at school but knows how to party on weekends.
U.P. by CHILLZ1127 June 11, 2006
Acronym for Unofficial Patch: a series of bug fixes, texture adjustments and just general gameplay tweaks to games that are publicly modifiable. These patches are not offered with retail copies of the game, and U.P.'s are usually made by skilled game modders or modding projects/collaborations, and not the game developer itself.
The Unofficial Skyrim Patch is an U.P.
U.P. by Unit-Omicron January 26, 2015
Hey bro you coming to the U P meeting later?
Yeah I hear it's the new cbt.
U P by DabutII October 9, 2019
Shorthand for "user/pass" or "username/password."

Generally used among 1337 hackers or IT professionals when discussing user credentials.
Ok, it's set up, the u/p is john123/password456.
U/P by WerriamMebster July 19, 2010
-Universal Pollutant, refer to somebody or something which is polluting the world. {U.P}
-Ultimate Pollutant
U.P is banned in any of our class WhatsApp group.
U.P by Anti- Pollution October 13, 2018
A spinoff of the term "A.I." or Artificial Intelligence, a "U.P.I." or User-Provisioned Intelligence" is any user-configured, programmatic entity with the capacity to perform tasks like its specific user would. This might include any of the visual, linguistic, behavioral, or decision-making operations an A.I. would perform, but done in a way characteristically identical to the manner of the user being emulated.

A U.P.I. might be a robot you teach to wash and fold your laundry exactly the way you like it, or a piece of software you train to respond to your emails.
Jennifer's intelligent doorbell was equipped with U.P.I., so as I pressed its sleek, glowing button, it quipped back at me in an all too Jenny-like sardonic tone, "Wait.”
U.P.I. by Otomo Money June 2, 2018
More from Urban Dictionary

proper lad 

a lad that is such a lad that he is a proper lad
person1:did you see bob
person2: ya he was a proper lad
Word of the Day on October 29, 2026
The number of years you are still sexually active
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
sexspan by Dr Kat April 21, 2022
Word of the Day on October 28, 2026
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.
womp by 175623226 November 3, 2011
Word of the Day on October 27, 2026
When your wife’s boyfriend let you sleep past 8pm 😎😎
Wife’s boyfriend: You have 5 more minutes
Me: Poggers!
Poggers by Just_Charles April 14, 2020
Word of the Day on October 26, 2026
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