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 October 31, 2006
Get the mug
Get a os-tan mug for your brother Günter.