"sad panda" meaning in English

{
  "etymology_text": "From \"Sexual Harassment Panda\", a 1999 episode of the animated comedy series South Park.",
  "forms": [
    {
      "form": "sad pandas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sad panda (plural sad pandas)",
      "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "People",
          "orig": "en:People",
          "parents": [
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "South Park",
          "orig": "en:South Park",
          "parents": [
            "American fiction",
            "Animation",
            "Fiction",
            "United States",
            "Mass media",
            "Artistic works",
            "North America",
            "Culture",
            "Media",
            "Art",
            "America",
            "Society",
            "Communication",
            "Earth",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An unhappy or disappointed person."
      ],
      "id": "en-sad_panda-en-noun-zN~Z440C",
      "raw_glosses": [
        "(informal) An unhappy or disappointed person."
      ],
      "tags": [
        "informal"
      ],
      "wikipedia": [
        "Sexual Harassment Panda"
      ]
    }
  ],
  "word": "sad panda"
}

{
  "etymology_text": "From \"Sexual Harassment Panda\", a 1999 episode of the animated comedy series South Park.",
  "forms": [
    {
      "form": "sad pandas",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sad panda (plural sad pandas)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:People",
        "en:South Park"
      ],
      "glosses": [
        "An unhappy or disappointed person."
      ],
      "raw_glosses": [
        "(informal) An unhappy or disappointed person."
      ],
      "tags": [
        "informal"
      ],
      "wikipedia": [
        "Sexual Harassment Panda"
      ]
    }
  ],
  "word": "sad panda"
}