"biggun" meaning in English

{
  "etymology_text": "Eye-dialect spelling of big 'un (one).",
  "forms": [
    {
      "form": "bigguns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "biggun (plural bigguns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Blimey, that's a biggun!"
        }
      ],
      "glosses": [
        "A large thing."
      ],
      "id": "en-biggun-en-noun-Fb7dkB4G",
      "raw_glosses": [
        "(informal) A large thing."
      ],
      "synonyms": [
        {
          "word": "whopper"
        },
        {
          "word": "bigun"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "biggun"
}

{
  "etymology_text": "Eye-dialect spelling of big 'un (one).",
  "forms": [
    {
      "form": "bigguns",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "biggun (plural bigguns)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English nouns"
      ],
      "examples": [
        {
          "text": "Blimey, that's a biggun!"
        }
      ],
      "glosses": [
        "A large thing."
      ],
      "raw_glosses": [
        "(informal) A large thing."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "whopper"
    },
    {
      "word": "bigun"
    }
  ],
  "word": "biggun"
}