chicken shit

chicken shit idiom
  1. Contemptibly petty or insignificant. For example, He has spent his life making up chicken shit rules that nobody follows anyway. This expression gained currency during World War II, when it was often applied to the enforcement of petty and disagreeable military regulations. [Vulgar slang; c. 1930]
  2. Cowardly, as in You're not too chicken shit to come along, are you? [Vulgar slang; mid-1940s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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