"great balls of fire" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
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      "examples": [
        {
          "ref": "1957, Otis Blackwell, Jack Hammer, Great Balls of Fire",
          "text": "Goodness gracious, great balls of fire!",
          "type": "quotation"
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      "glosses": [
        "Expressing great surprise."
      ],
      "id": "en-great_balls_of_fire-en-intj-xHr7vUD4",
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        "(idiomatic, euphemistic, dated) Expressing great surprise."
      ],
      "related": [
        {
          "word": "ball of fire"
        },
        {
          "word": "good gracious"
        },
        {
          "word": "goodness gracious me"
        },
        {
          "word": "oh my goodness gracious"
        }
      ],
      "synonyms": [
        {
          "word": "wow"
        }
      ],
      "tags": [
        "dated",
        "euphemistic",
        "idiomatic"
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    }
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  "word": "great balls of fire"
}

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      "expansion": "great balls of fire",
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  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "related": [
    {
      "word": "ball of fire"
    },
    {
      "word": "good gracious"
    },
    {
      "word": "goodness gracious me"
    },
    {
      "word": "oh my goodness gracious"
    }
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      "examples": [
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          "ref": "1957, Otis Blackwell, Jack Hammer, Great Balls of Fire",
          "text": "Goodness gracious, great balls of fire!",
          "type": "quotation"
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        "Expressing great surprise."
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        "(idiomatic, euphemistic, dated) Expressing great surprise."
      ],
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        "euphemistic",
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  "word": "great balls of fire"
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