not know from nothing

Slang Dictionary

not know from nothing definition

  1. in.
    to be stupid, innocent, and naive. (Usually with don't, as in the example. Always in the negative. See also know from (sth).) : Tom don't know from nothing. He is really dense.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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