not know one's ass from a hole in the ground

Slang Dictionary

not know one's ass from a hole in the ground definition


  1. tv.
    not to be knowledgeable; not to be alert and effective. (Usually objectionable.) : That stupid son of a bitch doesn't know his ass from a hole in the ground.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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