"jack-all" meaning in English

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          "ref": "2015, Amalie Berlin, Breaking Her No-Dating Rule, Harlequin, →ISBN, page 53:",
          "text": "“[…], or do you mean her reward is having to do jack-all?”",
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          "ref": "2018, Sean Grigsby, SA Sidor, Peter McLean, K C Alexander, Pulped Fiction: an Angry Robot Sampler, Watkins Media Limited, →ISBN:",
          "text": "They'd stripped off most of their usual I'm so badass vinyl in deference to the heat, sporting enhanced muscles, chrome accessories that did jack-all but look cool, and throwback pompadours they thought made them seem dangerous.",
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        "Alternative form of jack all"
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  "word": "jack-all"
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          "ref": "2015, Amalie Berlin, Breaking Her No-Dating Rule, Harlequin, →ISBN, page 53:",
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          "text": "They'd stripped off most of their usual I'm so badass vinyl in deference to the heat, sporting enhanced muscles, chrome accessories that did jack-all but look cool, and throwback pompadours they thought made them seem dangerous.",
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