putz n.

"obnoxious man, fool," by 1964, from Yiddish, from German putz, literally "finery, adornment," obviously used here in an ironic sense. Attested in writing earlier in slang sense of "penis" (1934, in "Tropic of Cancer"). A non-ironic sense is in putz "Nativity display around a Christmas tree" (1873), from Pennsylvania Dutch (German), which retains the old German sense.