"blow me over" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "blow me over",
      "name": "en-interj"
    }
  ],
  "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"
        }
      ],
      "examples": [
        {
          "ref": "1989, John le Carré, The Russia House",
          "text": "'Well blow me over, if it isn't Barley Bloody Blair,' a familiar voice declared from the centre of a multi-lingual display of illustrated Bibles.",
          "type": "quotation"
        },
        {
          "ref": "2016, Daniel Blackaby, The Lost City Chronicles",
          "text": "Well, blow me over. If it isn't Mr. Randilin himself. What a pleasant surprise!",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An expression of surprise."
      ],
      "id": "en-blow_me_over-en-intj-x~m0pbVV",
      "links": [
        [
          "surprise",
          "surprise#English"
        ]
      ],
      "raw_glosses": [
        "(UK, slang, archaic) An expression of surprise."
      ],
      "synonyms": [
        {
          "word": "wow"
        }
      ],
      "tags": [
        "UK",
        "archaic",
        "slang"
      ]
    }
  ],
  "word": "blow me over"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "blow me over",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "British English",
        "English entries with incorrect language header",
        "English interjections",
        "English lemmas",
        "English multiword terms",
        "English slang",
        "English terms with archaic senses",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1989, John le Carré, The Russia House",
          "text": "'Well blow me over, if it isn't Barley Bloody Blair,' a familiar voice declared from the centre of a multi-lingual display of illustrated Bibles.",
          "type": "quotation"
        },
        {
          "ref": "2016, Daniel Blackaby, The Lost City Chronicles",
          "text": "Well, blow me over. If it isn't Mr. Randilin himself. What a pleasant surprise!",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An expression of surprise."
      ],
      "links": [
        [
          "surprise",
          "surprise#English"
        ]
      ],
      "raw_glosses": [
        "(UK, slang, archaic) An expression of surprise."
      ],
      "tags": [
        "UK",
        "archaic",
        "slang"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "wow"
    }
  ],
  "word": "blow me over"
}