"scared shitless" meaning in English

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        "head": "scared shitless"
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      "expansion": "scared shitless (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Fear",
          "orig": "en:Fear",
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            "Emotions",
            "Mind",
            "Human",
            "All topics",
            "Fundamental"
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      ],
      "glosses": [
        "Very frightened, terrified."
      ],
      "id": "en-scared_shitless-en-adj-JRKeNoVF",
      "links": [
        [
          "frighten",
          "frighten"
        ],
        [
          "terrified",
          "terrified"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, vulgar, slang) Very frightened, terrified."
      ],
      "related": [
        {
          "word": "scare the shit out of"
        },
        {
          "word": "chickenshit"
        }
      ],
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        "idiomatic",
        "not-comparable",
        "slang",
        "vulgar"
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  "word": "scared shitless"
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{
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "scare the shit out of"
    },
    {
      "word": "chickenshit"
    }
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        "en:Fear"
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      "glosses": [
        "Very frightened, terrified."
      ],
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        [
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          "frighten"
        ],
        [
          "terrified",
          "terrified"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, vulgar, slang) Very frightened, terrified."
      ],
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