"fun sponge" meaning in English

{
  "etymology_text": "Suggesting that such a person, etc. would suck up the fun as a sponge sucks up water.",
  "forms": [
    {
      "form": "fun sponges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fun sponge (plural fun sponges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Someone who or something that takes the fun out of life; a killjoy."
      ],
      "id": "en-fun_sponge-en-noun-FJ6YBt6b",
      "links": [
        [
          "derogatory",
          "derogatory"
        ],
        [
          "killjoy",
          "killjoy"
        ]
      ],
      "raw_glosses": [
        "(figurative, informal, derogatory) Someone who or something that takes the fun out of life; a killjoy."
      ],
      "synonyms": [
        {
          "word": "buzzkill"
        },
        {
          "word": "killjoy"
        },
        {
          "word": "spoilsport"
        }
      ],
      "tags": [
        "derogatory",
        "figuratively",
        "informal"
      ]
    }
  ],
  "word": "fun sponge"
}

{
  "etymology_text": "Suggesting that such a person, etc. would suck up the fun as a sponge sucks up water.",
  "forms": [
    {
      "form": "fun sponges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "fun sponge (plural fun sponges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English derogatory terms",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "Someone who or something that takes the fun out of life; a killjoy."
      ],
      "links": [
        [
          "derogatory",
          "derogatory"
        ],
        [
          "killjoy",
          "killjoy"
        ]
      ],
      "raw_glosses": [
        "(figurative, informal, derogatory) Someone who or something that takes the fun out of life; a killjoy."
      ],
      "tags": [
        "derogatory",
        "figuratively",
        "informal"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "buzzkill"
    },
    {
      "word": "killjoy"
    },
    {
      "word": "spoilsport"
    }
  ],
  "word": "fun sponge"
}