An expression used to display surprise, disgust, hatred, awe, excitement or acceptance. Oos is a flexible term that can be jammed into almost any scenario and still make sense. Its pronunciation is paramount in order to convey maximum effectiveness. the oo at the start is said the same way as the oo in book is pronounced, and the s is normal. Oo-s.
Billy: Oi Kurt, dare you to drink the bong water you pussy faggot
Kurt: Yeah righto mate, bottoms up shit head! (drinks bong water)
Billy: Oos!

Jameson: Oi check that bird with the nice ass.
Max: Oos bro that's one hell of a piece!
(chick turns around and reveals a proper hunchback from 300 face)
Jameson & Max: Ooooooss!!

Bob: Oi Jessup, a hundred bucks if you shoot a basket from the half-way line.
Jessup: You're on mate. (He shoots, he scores!)
Bob: Oos cunt. Here's a watermelon.

Dangles: Oi Wally, what do you get when you throw a baby down the stairs?
Wally: I don't know you bloody noonga. What?
Dangles: An erection!
Wally: Oos.
by the mother fucking judge November 6, 2013
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To act in a lackadaisical manner, to herp derp occasionally, to roleplay a zombie during the daytime.
A: I'm ooing over to your place.
S: That's going to take double the amount necessary, so see you in 40 min!

A: I'm ooing to sleep.
S: Bedtime at 5AM again?
by renze April 20, 2015
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OO (pronounced Oh Oh) - Owner Operator (otherwise known as a wanker)
You are such an OO! (you are such a wanker)
by MeriAnn March 1, 2008
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A tech term that means "Out of service"

It can be a site, server or a provider
ex.
Yahoo is now OOS

or
internet provider is OOS
by Omar AbuAli May 5, 2009
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Person 1: I bet you can't do a better pig than me on here!
Person 2: Bring it on
Person 1: (oo)
Person 2: <(^(oo)^)>
Person 1: YOU BITCH
by pwnageseb March 30, 2014
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Emoticon for surprise in a bit of a caught off guard sense.
Optimus Prime: Hey, your mom just showed up over here.
Christopher: (=oo
by Christopher Frame June 6, 2006
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How the MTV Music 24 edit of "WHATS POPPIN" censors the phrase "fool with this shit".
"Told Pooh he a foo-OO-OO

Told her don't let her friends know."
by WazPoppin October 8, 2021
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