Top Definition
An person who's Ignorantly snubbish or has total disregard for knowledge.
Henry Gyrich is a total Jackclown who could do anything to get on The Avengers' bad side because he even revokes their priority status after taking issue with the team especially The Falcon.
by Mikekal August 23, 2009

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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