From Longman Dictionary of Contemporary Englishjack (shit)jack (shit)American English spoken not politeNONE/NOTHING a rude expression meaning anything at allHe doesn’t know jack shit about cars. → jack
Examples from the Corpus
jack (shit)• And there was a further twenty second time penalty for leaving a jack out of place.• It doesn't look like they did jack shit.• On the final end he moved the jack again to add another and finish 20-17 ahead.• Henry turned to her and held up the jack.• Money for plaintiffs' lawyers and court costs will jack the total up to some $ 550m. 