Top Definition
A contributor or lurker who, out of envy, spite or misplaced rectitude, combs through another contributor's list of words in order to deliberately give each one a "Down" thumb without considering any potential usefulness such words might have.
-- "Santa Claus? I don't get it, Kurt, who is against Santa Claus?"

-- "Poor ol' Burt, it looks like you've been the victim of the dumb thumb down. Check out your other entries to see if you got flamed there, too."
by al-in-chgo August 23, 2011

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