n. nonsense. (Also an exclamation.) : Rubbish! That's the stupidest thing I've ever heard.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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c.1400, from Anglo-Fr. rubouses (1392), of unknown origin. Apparently somehow related to rubble. The verb sense of "disparage, criticize harshly" is first attested 1953 in Australian and New Zealand slang.