chicken shit

Cowardly, as in You're not too chicken shit to come along, are you? [ Vulgar slang ; mid-1940s]

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]