n. a wimp; a weak person. : Don't be such a wuss. Stand up for your rights.
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
wuss
1982, from wussy (1960s), probably an alteration of pussy (2).
Mike Damone: You are a wuss: part wimp, and part pussy ["Fast Times at Ridgemont High" script, 1982]