n. a stupid and worthless person. (Usually refers to a male. Usually objectionable.) : What a jack-shit! Not a brain in his head!
n. anything; anything at all. (Always in a negative expression.) : This whole thing isn't worth jack-shit!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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