Out Of Stock. As in, a retailer is selling something and they ran out of it.
Check out this deal at somewebsite! It's a total steal! Oops, it's OOS.
by Anonymous_Cow April 24, 2006
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Out of Sync. Problem that used to plague Age of Mythology's online matchmaking service, ESO, until a patch fixed it. Any one player being "out of sync" would crash the game for all players involved. Only comes up now in rare instances.
Fizzuck, I got teh OoS and my game crashed. CURSES BE TO ZEUS!!
by Cataphract_40 September 21, 2004
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A surprised face.For best effect, add a period between the two o's for a nose.
"I just humped a car*
"OO..."
by Brian November 28, 2003
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Another face used on the computer, Looking like: "O.o" But with out the '.'
What the fuck was that? Oo;;
by PopPoochan! May 23, 2005
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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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an interjection used to express surpise, frustration, pleasure, admiration, or awe
oo you touched my tralala.
by papermachete October 27, 2005
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