"hell chicken" meaning in English

{
  "forms": [
    {
      "form": "hell chickens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hell chicken (plural hell chickens)",
      "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"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Theropods",
          "orig": "en:Theropods",
          "parents": [
            "Dinosaurs",
            "Reptiles",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An extinct bird-like reptile of species Anzu wyliei."
      ],
      "id": "en-hell_chicken-en-noun-kbJj4C-F",
      "links": [
        [
          "Anzu wyliei",
          "Anzu wyliei#Translingual"
        ]
      ],
      "raw_glosses": [
        "(slang) An extinct bird-like reptile of species Anzu wyliei."
      ],
      "synonyms": [
        {
          "word": "chicken from hell"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "hell chicken"
}

{
  "forms": [
    {
      "form": "hell chickens",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hell chicken (plural hell chickens)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang",
        "en:Theropods"
      ],
      "glosses": [
        "An extinct bird-like reptile of species Anzu wyliei."
      ],
      "links": [
        [
          "Anzu wyliei",
          "Anzu wyliei#Translingual"
        ]
      ],
      "raw_glosses": [
        "(slang) An extinct bird-like reptile of species Anzu wyliei."
      ],
      "synonyms": [
        {
          "word": "chicken from hell"
        }
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "hell chicken"
}