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
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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
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Unless Otherwise Specified.
That is, a qualifier used to indicate that all members of a group have a given quality, excepting those which are explicated to NOT demonstrate said quality.
All images on this website copyright bidensandwich.com uos.

List of common dosages (all units in milligrams uos):
Ibuprofen: 400
Acetaminophen: 600
LSD: 50 micrograms
Aspirin: 320
Insulin: .15mL
by RunningFool July 16, 2011
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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 April 28, 2007
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sound produced by a confused Latin American
Random Jap. girl:私は巨大なペニスを吸うのが大好きです
Agus: UOS UOS!
by jhonny suckadick December 12, 2017
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