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a parable combined with a riddle, most commonly associated with the teaching of Zen buddhism. A koan confronts the student with a seemingly impenetrable question which is only resolved when through acheiving a deeper understanding of the philosophical point being taught.
One of the most famous koans is "What is the sound of one hand clapping?"
by Figleaf23 August 05, 2007
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Someone who invents sexual conquest stories to sound superior or to impress friends.
Guy 1: Dude that guy is such a Koan.

Guy 2: Yeh man I know last week he told me he lost his virginity giving a girl a dirty sanchez when he was 14.

Guy 1: Haha. What a loser.
by ArghDontTouchMe October 25, 2006
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