How doyou say useful idiot in Yiddish ?
The following terms may apply here:
shlemiel; A clumsy, inept person, similar to a klutz (also a Yiddish word). The kind of person who always spills his soup.
PUTZ: A vulgarism for penis but most usually used as term of contempt for a fool, or an easy mark.
SHLIMAZL: A chronically unlucky person, a born loser, when a shlimazl sells umbrella the sun comes out.
FERTUMMELT: Befuddled, confused
NUDNIK: A pest, a persistent and annoying person.