"ugly as bull-beef" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "ugly as bull-beef (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
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        },
        {
          "kind": "other",
          "name": "English similes",
          "parents": [],
          "source": "w"
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          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Appearance",
          "orig": "en:Appearance",
          "parents": [
            "Perception",
            "Body",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Very ugly."
      ],
      "id": "en-ugly_as_bull-beef-en-adj-uhLEJjYz",
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, slang, archaic) Very ugly."
      ],
      "related": [
        {
          "word": "big as bull-beef"
        }
      ],
      "tags": [
        "archaic",
        "not-comparable",
        "slang"
      ]
    }
  ],
  "word": "ugly as bull-beef"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "ugly as bull-beef (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "big as bull-beef"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English similes",
        "English slang",
        "English terms with archaic senses",
        "English terms with non-redundant non-automated sortkeys",
        "English uncomparable adjectives",
        "en:Appearance"
      ],
      "glosses": [
        "Very ugly."
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, slang, archaic) Very ugly."
      ],
      "tags": [
        "archaic",
        "not-comparable",
        "slang"
      ]
    }
  ],
  "word": "ugly as bull-beef"
}