"that ever walked on two legs" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "that ever walked on two legs",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "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"
        }
      ],
      "examples": [
        {
          "ref": "1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], →OCLC, part I, page 198:",
          "text": "Oh, it didn’t surprise me in the least to hear this, and at the same time to be told that Fresleven was the gentlest, quietest creature that ever walked on two legs.",
          "type": "quote"
        }
      ],
      "glosses": [
        "That ever lived."
      ],
      "id": "en-that_ever_walked_on_two_legs-en-phrase-GnIqqE0d",
      "raw_glosses": [
        "(idiomatic) That ever lived."
      ],
      "related": [
        {
          "word": "as ever trod shoe-leather"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "that ever walked on two legs"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "that ever walked on two legs",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "related": [
    {
      "word": "as ever trod shoe-leather"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], →OCLC, part I, page 198:",
          "text": "Oh, it didn’t surprise me in the least to hear this, and at the same time to be told that Fresleven was the gentlest, quietest creature that ever walked on two legs.",
          "type": "quote"
        }
      ],
      "glosses": [
        "That ever lived."
      ],
      "raw_glosses": [
        "(idiomatic) That ever lived."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "that ever walked on two legs"
}