UO

UO is a PC game, short for Ultima Online. It first came about around the end of September to early October of 1997, and is still running today. It was originally 2D, but now had spread to 3D, and has around 250,000 players from all over the world. The setting is, in my opinion, semi-Renaissance, with mages and magical spells, dragons, "recalling", which is casting a spell to get from one place to another, house ownership, items, weapons, monsters, and unlimited possibilities. You can talk to people, form hunting parties, even guilds and communities. Unfortunately, the game has been a bit nerfed for years, and ever since Age of Shadows, an expansion pack, the game isn't what it used to be. But the game is always changing, and can still be great fun.

Aww, they ran out of UO gametime cards...

by Angelfyre April 3, 2005

UO

UO, short for Ultima Online is a well known widely played game, its been around for many years and is still a sweet game.

I needa get my hands on a UO disc man!
Fuck that shit im playing UO dude.
Gimme a minute baby im playing UO atm.
UO is teh mad not.

by DaN` July 8, 2003

Uo

Someone who is cool as fuuuuck. Nice genderless name

Hey have you seen Uo?
Yeah, I just saw them in the libary

by Uoiscool August 28, 2021

Pro UO

Refers to those in the game Ultima Online.

People who devote ample amounts of time to improve their skill in the game, and take it seriously than most others.

We just got owned again. Those guys are Pro UO.

by Blot May 8, 2007

aw uo dood

look at it in a 360 angle

Johnny: You suck!
Timmy: .aw uo dood

by 30033 June 13, 2025

UO

A term used to signify that something is Unofficial — not formally recognized, approved, or confirmed. Often used in texting, online forums, leaks, or fan communities to label content, events, or information that hasn’t been verified or officially released.

Ludwig: Hey chat I followed this moistcr1tikal Instagram page
Chat: Bro it literally says UO in the bio, that’s not an official account
Ludwig: UO doesn’t stand for Unofficial wdym
Chat: “English major”

by Words Words June 4, 2025

Uose

The pasted tense of use

He uose that tissue

by Paintshop NJ October 4, 2021