"common as muck" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "common as muck (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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          "kind": "other",
          "name": "English similes",
          "parents": [],
          "source": "w"
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      "examples": [
        {
          "ref": "2011, David McWilliams, The Pope's Children, page 52:",
          "text": "How many times have you heard a young mother roll her eyes up to heaven at the sound of another mum calling out the name of her child, only to realize that the name she picked is now common as muck?",
          "type": "quote"
        }
      ],
      "glosses": [
        "Very common (in various senses)."
      ],
      "id": "en-common_as_muck-en-adj-1GlTYkW7",
      "links": [
        [
          "common",
          "common"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very common (in various senses)."
      ],
      "synonyms": [
        {
          "word": "common as pig tracks"
        },
        {
          "tags": [
            "Australia",
            "colloquial"
          ],
          "word": "common as bums"
        }
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-common as muck.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8b/En-au-common_as_muck.ogg/En-au-common_as_muck.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/8/8b/En-au-common_as_muck.ogg"
    }
  ],
  "word": "common as muck"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "common as muck (not comparable)",
      "name": "en-adj"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
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        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English similes",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2011, David McWilliams, The Pope's Children, page 52:",
          "text": "How many times have you heard a young mother roll her eyes up to heaven at the sound of another mum calling out the name of her child, only to realize that the name she picked is now common as muck?",
          "type": "quote"
        }
      ],
      "glosses": [
        "Very common (in various senses)."
      ],
      "links": [
        [
          "common",
          "common"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very common (in various senses)."
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-common as muck.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/8b/En-au-common_as_muck.ogg/En-au-common_as_muck.ogg.mp3",
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  "synonyms": [
    {
      "word": "common as pig tracks"
    },
    {
      "tags": [
        "Australia",
        "colloquial"
      ],
      "word": "common as bums"
    }
  ],
  "word": "common as muck"
}