Green’s Dictionary of Slang

(US black) contemptible.

1935		E. Freeman ‘The Whirling Hub’ in Afro-American (Baltimore, MD) 16 Mar. 15/1: Watch out for Mocha and his gut-bucket stooges.
1971		(con. 1930s–50s) D. Wells Night People 117: Gutbucket, adj., Lowdown and ornery.