short for opposite sex
In my free time, I do fun things with multiple members of the o.s.
by KatyxToxic January 26, 2008
os
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
open source directory

Mean

os dir
by peter edin August 27, 2008
OS
Operating System. Some are designed to be available to everyone (Linux :).
Some are designed to take your money (Windoes :().
....................
# Examples of OSes #
....................
Linux
Free/Open BSD
Solaris
Unix
Windoes
MacOs X
....................
by :) February 05, 2005
oS
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 11, 2006
Os
Latin for "mouth". Used to describe the small opening of a woman's cervix, either on the vaginal side of the cervix, or on the uterine side.

Pronounced: "Oz" or "Oss"
"The cervical canal has a constricted opening or os at each end. The internal os communicates with the cavity of the uterus; the external os, with the vagina."
Knowledge is power.
by PupNTaco June 10, 2005
o's
common baltimorian nickname for the Orioles, the best team in baseball history, arch-enemies of the New York Yankees, also emphasized heavily in the national anthem
O's baby... O-R-I-O-L-E-S
by J May 05, 2005
OS
Official Site
Two SYTYCD fans chatting: Saw it on a Pops Poll on OS.
by L.Skywalker March 10, 2009

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