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Comes from the language of 1337 or leet in which gamers describe another as a dominating opponent. It is also a form of the word owner where the attacker is Owning the other.
d00d, taht guy is a pwn3r. check him out hes gonna go pwn that guy in the fuxoring head. B00M HEAD SH0T!

Jack's head was turned into red jello.
by (GW)FPS Doug January 26, 2006