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A "know-it-all" or "Cliff Clavin". Someone who considers themselves to be an expert on everything. A human storehouse of useless trivia, often of dubious veracity.
"That guy is so wikipedic...full of useless information and he never shuts up!"

"Why did I bring that up in front of so-and-so? I thought I'd never hear the end of it from Mrs. Wikipedic."

know-it-all Cliff Clavin
by kissmintz January 17, 2012
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