"scum of the earth" meaning in English

{
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      "expansion": "scum of the earth (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "People who refuse to tip are the scum of the earth.",
          "type": "example"
        }
      ],
      "glosses": [
        "An undesirable individual; the worst type of person or people."
      ],
      "id": "en-scum_of_the_earth-en-noun-S4XFrhWw",
      "links": [
        [
          "derogatory",
          "derogatory"
        ]
      ],
      "raw_glosses": [
        "(informal, derogatory) An undesirable individual; the worst type of person or people."
      ],
      "related": [
        {
          "word": "salt of the earth"
        }
      ],
      "tags": [
        "derogatory",
        "informal",
        "uncountable"
      ]
    }
  ],
  "word": "scum of the earth"
}

{
  "head_templates": [
    {
      "args": {
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      "expansion": "scum of the earth (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "salt of the earth"
    }
  ],
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    {
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        "English derogatory terms",
        "English entries with incorrect language header",
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      "examples": [
        {
          "text": "People who refuse to tip are the scum of the earth.",
          "type": "example"
        }
      ],
      "glosses": [
        "An undesirable individual; the worst type of person or people."
      ],
      "links": [
        [
          "derogatory",
          "derogatory"
        ]
      ],
      "raw_glosses": [
        "(informal, derogatory) An undesirable individual; the worst type of person or people."
      ],
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        "derogatory",
        "informal",
        "uncountable"
      ]
    }
  ],
  "word": "scum of the earth"
}