"chinny reckon" meaning in English

{
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "West Country English",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An expression of disbelief or doubt at what one has just heard."
      ],
      "id": "en-chinny_reckon-en-intj-V41I-Yto",
      "raw_glosses": [
        "(UK, slang) An expression of disbelief or doubt at what one has just heard."
      ],
      "related": [
        {
          "word": "SMH"
        }
      ],
      "synonyms": [
        {
          "word": "go on"
        },
        {
          "tags": [
            "archaic"
          ],
          "word": "Walker"
        },
        {
          "word": "bullshit"
        }
      ],
      "tags": [
        "UK",
        "slang"
      ]
    }
  ],
  "word": "chinny reckon"
}

{
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "related": [
    {
      "word": "SMH"
    }
  ],
  "senses": [
    {
      "categories": [
        "British English",
        "English entries with incorrect language header",
        "English interjections",
        "English lemmas",
        "English multiword terms",
        "English slang",
        "Pages with 1 entry",
        "Pages with entries",
        "West Country English"
      ],
      "glosses": [
        "An expression of disbelief or doubt at what one has just heard."
      ],
      "raw_glosses": [
        "(UK, slang) An expression of disbelief or doubt at what one has just heard."
      ],
      "tags": [
        "UK",
        "slang"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "go on"
    },
    {
      "tags": [
        "archaic"
      ],
      "word": "Walker"
    },
    {
      "word": "bullshit"
    }
  ],
  "word": "chinny reckon"
}