jack shit

noun

jack shit

noun

1

Slang, Vulgar Nothing; (a lack of) anything (i.e., of value).

In the negative or double negative

I [won't/will] do jack shit for you if you get lost.
Oh, you're in charge? Well, I got some bad news for you Dwayne, from up here it doesn't look like you're in charge of jack shit.1988, Jeb Stuart, Steven E. de Souza, Die Hard, spoken by John McClane (Bruce Willis):

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