Green’s Dictionary of Slang

schmucky adj.

stupid.

1952		(con. 1920s) ‘Harry Grey’ Hoods (1953) 209: They don’t know their elbows from their asses. Dumb schmucky bastards.
1967		L. Bruce Essential Lenny Bruce 179: Here come two schmuky cops.
1981		M. Baker Nam (1982) 140: The bodies don’t have any ears. The schmuck general went fucking nuts.
1995		C. Hiaasen Stormy Weather 106: Dade County’s inspectors were as culpable for the destruction as schmuck salesmen like Torres.