"pigs might fly" meaning in English

{
  "forms": [
    {
      "form": "pigs can fly",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "pigs may fly",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase",
        "head": "pigs might fly"
      },
      "expansion": "pigs might fly",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Dutch translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "\"I'm sure he'll pay you back tomorrow.\" \"Yeah right, and pigs might fly.\"",
          "type": "example"
        }
      ],
      "glosses": [
        "A response (often with a hint of sarcasm) to a situation which one thinks that there is no chance of ever occurring."
      ],
      "id": "en-pigs_might_fly-en-phrase-YnqqtfF1",
      "links": [
        [
          "sarcasm",
          "sarcasm#English"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A response (often with a hint of sarcasm) to a situation which one thinks that there is no chance of ever occurring."
      ],
      "synonyms": [
        {
          "word": "monkeys might fly out of my butt"
        }
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "Translations",
          "word": "maak dat de kat wijs"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "word": "wer's glaubt, wird selig"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-pigs might fly.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/0a/En-au-pigs_might_fly.ogg/En-au-pigs_might_fly.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/0/0a/En-au-pigs_might_fly.ogg"
    },
    {
      "rhymes": "-aɪ"
    }
  ],
  "word": "pigs might fly"
}

{
  "forms": [
    {
      "form": "pigs can fly",
      "tags": [
        "alternative"
      ]
    },
    {
      "form": "pigs may fly",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase",
        "head": "pigs might fly"
      },
      "expansion": "pigs might fly",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with usage examples",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:English/aɪ",
        "Rhymes:English/aɪ/3 syllables",
        "Terms with Dutch translations",
        "Terms with German translations",
        "Translation table header lacks gloss"
      ],
      "examples": [
        {
          "text": "\"I'm sure he'll pay you back tomorrow.\" \"Yeah right, and pigs might fly.\"",
          "type": "example"
        }
      ],
      "glosses": [
        "A response (often with a hint of sarcasm) to a situation which one thinks that there is no chance of ever occurring."
      ],
      "links": [
        [
          "sarcasm",
          "sarcasm#English"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A response (often with a hint of sarcasm) to a situation which one thinks that there is no chance of ever occurring."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-pigs might fly.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/0/0a/En-au-pigs_might_fly.ogg/En-au-pigs_might_fly.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/0/0a/En-au-pigs_might_fly.ogg"
    },
    {
      "rhymes": "-aɪ"
    }
  ],
  "synonyms": [
    {
      "word": "monkeys might fly out of my butt"
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "Translations",
      "word": "maak dat de kat wijs"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "word": "wer's glaubt, wird selig"
    }
  ],
  "word": "pigs might fly"
}