n. a stupid and ineffectual nobody. (Yiddish.) : Some schmendrick from downstairs asked if you could turn down your stereo.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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"stupid person," 1944, from Yiddish shmendrik, from the name of a character in an operetta by Avrom Goldfaden (1840-1908), “Father of Yiddish Theater.”