jack shit

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jack shit

rude slang Anything or any amount (of something) at all. Always used in negative constructions to express a complete and utter lack of something. Just shut up, Tom. You don't know jack shit about marketing. I spent a whole day in the library doing research, but I didn't find jack shit to use for my thesis.
See also: jack, shit
Farlex Dictionary of Idioms.

jack-shit

1. n. a stupid and worthless person. (Usually refers to a male. Usually objectionable.) What a jack-shit! Not a brain in his head!
2. n. anything; anything at all. (Always in a negative expression.) This whole thing isn’t worth jack-shit!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • anytime soon
  • bag
  • (one's) bag
  • perceive
  • perceive (someone or something) as (something)
  • perceive as
  • preclude
  • preclude (someone or something) from (something)
  • preclude from