"John Thomases" meaning in English

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          "ref": "2010, John Hignett, England Never Slept, page 142",
          "text": "What a sight the four of us must have made, standing with water up to our thighs, our hands firmly clutched over our John Thomases.",
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        "plural of John Thomas"
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  "word": "John Thomases"
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  "lang_code": "en",
  "pos": "noun",
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          "ref": "2010, John Hignett, England Never Slept, page 142",
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          "type": "quotation"
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      "form_of": [
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