Someone who claims to have an advanced knowledge of a subject they actually know little or nothing about.
Person 1: "Hey, have you see the newest episode of House?"
Person 2: "Uh... yeah, it was awesome."
Person 1: "Have you ever even seen the show?"
Person 2: "Umm... sure... I've like... seen every episode."
Person 1: "Dude, stop being such a know-it-all wannabe."
by Shquiggles November 09, 2009

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