<Noun> Computer gaming slang.
A person who, during an internet computer game, kills or damages their team mates intentionally in order to either help the other team (to which they may also be referred to as 'spies') or just to be a cock sucker and/or n00b.
May be abbreviated to TK'er.
CHIEF: "Master K is such a fucking TK'er."
MASTER K: "OMGWTF n00b STFU!!!11"
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