"sis boom bah" meaning in English

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      "expansion": "Onomatopoeic",
      "name": "onomatopoeic"
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  "etymology_text": "Onomatopoeic",
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      "expansion": "sis boom bah",
      "name": "en-interj"
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  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
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          "kind": "other",
          "name": "American English",
          "parents": [],
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          "kind": "topical",
          "langcode": "en",
          "name": "Cheerleading",
          "orig": "en:Cheerleading",
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      "glosses": [
        "An exclamation of encouragement."
      ],
      "id": "en-sis_boom_bah-en-intj-W1sIyQcX",
      "links": [
        [
          "cheerleading",
          "cheerleading#Noun"
        ],
        [
          "exclamation",
          "exclamation#English"
        ],
        [
          "encouragement",
          "encouragement#English"
        ]
      ],
      "raw_glosses": [
        "(US, cheerleading) An exclamation of encouragement."
      ],
      "related": [
        {
          "_dis1": "78 22",
          "word": "cheering"
        }
      ],
      "tags": [
        "US"
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      "topics": [
        "cheerleading",
        "hobbies",
        "lifestyle",
        "sports"
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    },
    {
      "categories": [],
      "glosses": [
        "The characteristic sound made by fireworks."
      ],
      "id": "en-sis_boom_bah-en-intj-5O7wZ3jg",
      "links": [
        [
          "fireworks",
          "fireworks#English"
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      ],
      "raw_glosses": [
        "(dated) The characteristic sound made by fireworks."
      ],
      "tags": [
        "dated"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɑː"
    }
  ],
  "word": "sis boom bah"
}

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      "expansion": "sis boom bah",
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  "lang_code": "en",
  "pos": "intj",
  "related": [
    {
      "word": "cheering"
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  "senses": [
    {
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      "glosses": [
        "An exclamation of encouragement."
      ],
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          "cheerleading",
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        ],
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          "exclamation",
          "exclamation#English"
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      "raw_glosses": [
        "(US, cheerleading) An exclamation of encouragement."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "cheerleading",
        "hobbies",
        "lifestyle",
        "sports"
      ]
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      "glosses": [
        "The characteristic sound made by fireworks."
      ],
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      ],
      "raw_glosses": [
        "(dated) The characteristic sound made by fireworks."
      ],
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  "sounds": [
    {
      "rhymes": "-ɑː"
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  "word": "sis boom bah"
}