schnook

noun Slang.

1. an unimportant or stupid person; dope.

noun

1. US slang a stupid or gullible person

n.1948, probably from Yiddish shnuk “elephant’s trunk,” or altered from schmuck (q.v.), or perhaps from German schnucke “a small sheep,” used in U.S. Yiddish for “a customer easily persuaded, a sucker.”