This is an abbreviation used exclusively for games in the Halo series. It stands for OverShield.
p1: wtf? how didn't you die?

p2: I picked up an OS
by Drüd September 1, 2008
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Slang word for a power up in the popular game Halo 2 means Overshield. Gives you 2 extra layers of shield
"Pick up the OS you wont die!"
by Mex4life1992 November 11, 2006
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A guy with a huge heart but a small dick. A little gay, but he always has to worry about immigration. Overall, he's an amazing guy with a good sense of humor.
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The best operating system ever created. Created by our god Terry Davis.
temple os is the best, I have no clue why anyone is running anything else!
by Wintier July 15, 2017
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An exampe of an Operating System made by a team from IBM and Microsoft in the early ninties. The team broke up and made diffrent versions.
OS/2 is shitzle.
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Os-tans are anime personifications of operating systems as girls. Another name for it them is OS-girls. It all started when some random guy in Japan working at futaba channel thought Windows ME was like a tempermental troublesome girl who did all kinds of stupid things that lacked common sense.
person1: Xp-tan is a os-tan she has really big boobs!
Other person: YOU ARE PERVE!
by clueless_furball November 1, 2006
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Smoke rings blown after inhaling opium.
"I can make opi-os!"
-Ralph Wiggum
by Thundermonkey1992 November 2, 2010
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