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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
OOS by Omar AbuAli May 5, 2009
Related Words

Hood Oos 

Australian slang used to scare of enemies or to be used as a war cry mid battle used by the elite Australian street fighters
Hood Oos by nawhneg February 17, 2021
The oldest known definition that precedes all these Millennial driven meanings is that of, "Yes, I understand" which has it's roots in martial arts training or history of the GoJu Ryu. That is the deepest most meaningful meaning. However, it also expands over a broader range to mean, "I see. I acknowledge."

Eg. Someone shows you how to do something. Oos! And is said in thankful tone.

You can approach someone right after graduation. Oooos! Said with excitement.

You can be reprimanded about something. Oos. Said with an I'm sorry attitude.

There is a whole yin-yang aspect to it. Can be soft, hard, or however it needs to conform to the scenario.
Tony was training for a full contact fight and was placed on a strict diet. While working for Sensei, he dumbly ordered a pizza and proceeded to eat it in front of Sensei. Clearly Sensei was not pleased. He reamed Tony out with disbelief. Tony replied in an apologetic but understanding manner, Oos Sensei. Tony went on to lose the fight is fat today

Johnny was courting Stephanie for a few months, but was holding out. When Johnny woke up in the morning with a massive smile, his roommate knowing that Stephanie slept over, he paused and said, Noooo?! Johnny said with a huge grin, YES! Johnny replied almost yelling, OOOOOOOS! and fist bumping him.

Jill was a 1st year resident at the local hospital. During the operating room procedure the surgeon showed her how to do a technique. She replied, thankfully, Oos. The surgeon said, "hunh". Jill said, oh, sorry...had you mixed up with my Sensei. The surgeon still confused proceeded with the case.
Oos by Cat's Incredulous June 12, 2021

Oos Diggy Das 

An exclamation to be blurted out when witnessing a fail, or while failing yourself.
Clarence, whilst out strolling, was fortunate enough to witness a drunken individual being ejected over the handlebars of a bicycle. "Hmm, muttered Clarence, that is most definitely an Oos Diggy Das"...
Oos Diggy Das by StevePoodle May 21, 2022
The sound a vagina makes when a large object is thrust into it.
oos oos oos oos oos oos oos oos oos
oos by gabeZilla December 7, 2004
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!"
OOS by Maybelline October 22, 2007