"dog my cats" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
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          "ref": "1884 December 10, Mark Twain [pseudonym; Samuel Langhorne Clemens], The Adventures of Huckleberry Finn: (Tom Sawyer’s Comrade) […], London: Chatto & Windus, […], →OCLC:",
          "text": "Why, dog my cats, they must a ben a house-full o' niggers in there every night for four weeks to a done all that work, Sister Phelps.",
          "type": "quote"
        },
        {
          "ref": "1906, O. Henry, The Four Million:",
          "text": "\"I began to feel sorry for Hubby, dog my cats if I didn't.\"",
          "type": "quote"
        },
        {
          "text": "Buffalo Bill Cody: \"Dog my cats\" — Preston Sturgis, \"Annie Oakley\", 1935"
        },
        {
          "text": "Salesman: \"Well, dog my cats!\" — Moroni Olsen, \"Christmas in July\", 1940"
        },
        {
          "text": "Joe Ross: \"Dog my cats indeed\" — David Mamet, \"The Spanish Prisoner\", 1997"
        },
        {
          "text": "Marshall Eriksen: \"Well, dog my cats...\" — Jason Segel, \"How I Met Your Mother\", 2010"
        }
      ],
      "glosses": [
        "Used as a mild oath, or as an expression of astonishment"
      ],
      "id": "en-dog_my_cats-en-intj-~B~FAOnn",
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        "(idiomatic) Used as a mild oath, or as an expression of astonishment"
      ],
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        "idiomatic"
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  "word": "dog my cats"
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  "lang_code": "en",
  "pos": "intj",
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          "ref": "1884 December 10, Mark Twain [pseudonym; Samuel Langhorne Clemens], The Adventures of Huckleberry Finn: (Tom Sawyer’s Comrade) […], London: Chatto & Windus, […], →OCLC:",
          "text": "Why, dog my cats, they must a ben a house-full o' niggers in there every night for four weeks to a done all that work, Sister Phelps.",
          "type": "quote"
        },
        {
          "ref": "1906, O. Henry, The Four Million:",
          "text": "\"I began to feel sorry for Hubby, dog my cats if I didn't.\"",
          "type": "quote"
        },
        {
          "text": "Buffalo Bill Cody: \"Dog my cats\" — Preston Sturgis, \"Annie Oakley\", 1935"
        },
        {
          "text": "Salesman: \"Well, dog my cats!\" — Moroni Olsen, \"Christmas in July\", 1940"
        },
        {
          "text": "Joe Ross: \"Dog my cats indeed\" — David Mamet, \"The Spanish Prisoner\", 1997"
        },
        {
          "text": "Marshall Eriksen: \"Well, dog my cats...\" — Jason Segel, \"How I Met Your Mother\", 2010"
        }
      ],
      "glosses": [
        "Used as a mild oath, or as an expression of astonishment"
      ],
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        "(idiomatic) Used as a mild oath, or as an expression of astonishment"
      ],
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        "idiomatic"
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