n. a stupid and clumsy person. : Don't be a klutz!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
klutz
1965 (implied in klutzy), Amer.Eng., from Yiddish klots "clumsy person, blockhead," lit. "block, lump," from M.H.G. klotz "lump, ball."