"useful as a chocolate teapot" meaning in English

{
  "etymology_text": "Since a chocolate teapot would be melted by hot tea and is therefore a useless idea.",
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      "expansion": "useful as a chocolate teapot",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Chocolate",
          "orig": "en:Chocolate",
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      "derived": [
        {
          "word": "chocolate teapot"
        }
      ],
      "glosses": [
        "Totally useless."
      ],
      "id": "en-useful_as_a_chocolate_teapot-en-phrase-L9SBiymK",
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        [
          "useless",
          "useless"
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      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Totally useless."
      ],
      "synonyms": [
        {
          "word": "as much use as a chocolate fireguard"
        },
        {
          "word": "as much use as a chocolate teapot"
        },
        {
          "word": "useful as tits on a bull"
        }
      ],
      "translations": [
        {
          "code": "gd",
          "lang": "Scottish Gaelic",
          "sense": "Totally useless",
          "word": "cho feumail ri pàillean am fàsach"
        }
      ]
    }
  ],
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  "word": "useful as a chocolate teapot"
}

{
  "derived": [
    {
      "word": "chocolate teapot"
    }
  ],
  "etymology_text": "Since a chocolate teapot would be melted by hot tea and is therefore a useless idea.",
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      "expansion": "useful as a chocolate teapot",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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        "en:Chocolate"
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      "glosses": [
        "Totally useless."
      ],
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        [
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          "useless"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Totally useless."
      ],
      "synonyms": [
        {
          "word": "as much use as a chocolate fireguard"
        },
        {
          "word": "as much use as a chocolate teapot"
        },
        {
          "word": "useful as tits on a bull"
        }
      ]
    }
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  "synonyms": [
    {
      "word": "as much use as a chocolate teapot"
    }
  ],
  "translations": [
    {
      "code": "gd",
      "lang": "Scottish Gaelic",
      "sense": "Totally useless",
      "word": "cho feumail ri pàillean am fàsach"
    }
  ],
  "word": "useful as a chocolate teapot"
}