"nonsense, rubbish," 1940, U.S. slang; originally 1920s army and college student slang for "venereal disease." Said to be a metathesis variant of curd, which actually makes it an unconscious return to the original M.E. form of that word (see curd). As G.I. name for "disease
n. any nasty substance. (An old form of the word curd.) : There's some crud on your left shoe.
n. junk; stuff; personal possessions. : Get your crud outa my way, will you!
n. a repellent person. (Rude and derogatory.) : Don't be such a crud!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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