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The leet or 1337 way of saying K.O(knockout).

A particularly kool player uses the term k0 instead of the regular K.O when reffering to someone getting killed, usually in an MMORPG game.
pker:*links 25-34 spec on lvl 51 noob, instant K.O*
random guy watching: omg! k0!
pker: k0, c ya in lumby, n00b.
by TACTICALSQUAD August 14, 2008