A dumbass person who never get herself off tiktok and loves food
by Ksisisiskskskek May 31, 2020
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simply its mean for most of us:

Open Source

may be the same characters have other meaning , but the most popular is open source.

And these is some other meaning for OS characters:
http://en.wikipedia.org/wiki/Os
by peter edin August 27, 2008
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oS stands for Old School. 'Tis an abbreviation for oS.

The lowercase-then-uppercase type is a way of making it look cooler. "oS" originated from Nitto 1320 Challenge, where we painted oS on our cars while on the team OldSchoolRacing, and even use oS on our cars to show that we've been playing for a long time and say it in chats across the web to this day. A note, oS should not be said in real life, you just say "Old School".
Ice Cube is Old School.
Ice Cube is oS.

The oS's are what makes OldSchoolRacing the best.
by protectmeaura December 12, 2006
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Os is the initals of a very special person. The most beautiful hair, and eyes you can get lost in. Most of all, she’s one cool gal.
Hey! Isn’t that Os? She’s so awesome!
by Maybe.ken February 20, 2022
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Two SYTYCD fans chatting: Saw it on a Pops Poll on OS.
by L.Skywalker March 10, 2009
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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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