"hf" meaning in English

{
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "have fun"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of have fun."
      ],
      "id": "en-hf-en-intj-enIjDbln",
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "have fun",
          "have fun#English"
        ]
      ],
      "raw_glosses": [
        "(Internet slang) Abbreviation of have fun."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "hf"
}

{
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "have fun"
        }
      ],
      "categories": [
        "English abbreviations",
        "English entries with incorrect language header",
        "English interjections",
        "English internet slang",
        "English lemmas",
        "English words without vowels"
      ],
      "glosses": [
        "Abbreviation of have fun."
      ],
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "have fun",
          "have fun#English"
        ]
      ],
      "raw_glosses": [
        "(Internet slang) Abbreviation of have fun."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "hf"
}