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1 definition by ThruTheDesertOvrTheFence

One makes a single random comment in someone elses conversation, which ends up killing it and making it awkward for everyone else. This is similar to a ninja swiftly killing a target then exiting.
Guy 1: Hey, do you see that really hot chick over there?
Guy 2: Hell yea, Id hit that all night!
Conversation Ninja: I screwed her and gave her herpes *disappears*
Guy 1: Oh... Im gonna go now.
by ThruTheDesertOvrTheFence September 13, 2009