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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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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1: Out of stock, as in a brand being sold out.
2: Out of style
1: Aw man! The shoes I wanted in my size are OOS!
2: "Did you see Ashley yesterday? Her Juicy trackpants are so OOS!"
by Maybelline October 7, 2007
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An emoticon used to represent an e30 BMW.
I used to drive a oo==oo...it was fun.
by VooDooXII September 11, 2006
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a sound in which a person or a crowd makes when a person gets in trouble
David got ooed when the teacher asked to talk with him
by RomeTwinn March 31, 2017
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