n. a naive person; a dope. (Yiddish.) : What's a good-looking dame like her doing with a shnook like him?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
schnook
1948, probably from Yiddish shnuk "elephant's trunk," or altered from schmuck (q.v.), or perhaps from Ger. schnucke "a small sheep," used in U.S. Yiddish for "a customer easily persuaded, a sucker."