os² 

os² is the smaller version of the words oh shit son, or oshtson

n00b1:yo man that guy just got a headshot with a shotty
n00b2: os²

os² by dipsert June 27, 2006

OS/2 

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.
osba.info

OS/2 by nerdman of OsBetaArchive.com May 10, 2005

OS/2 

A stable 32 bit Operating System developed by IBM that nobody uses anymore.

OS/2 by w00tw00t April 5, 2003

OS/2 

Formula for determining one half of one operating system.

OS/2 by Dennis October 15, 2003