"what the eff" meaning in English

{
  "etymology_text": "See eff (“fuck”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "what the eff",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English euphemisms",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2014, Michael Griffo, Starfall (The Darkborn Legacy), New York, NY: Kensington Publishing Corporation, →ISBN, page 94:",
          "text": "“Don't take this the wrong way, Archie,” Arla begins, “but what the ef are you talking about?”",
          "type": "quote"
        }
      ],
      "form_of": [
        {
          "word": "what the fuck"
        }
      ],
      "glosses": [
        "Euphemistic form of what the fuck."
      ],
      "id": "en-what_the_eff-en-phrase-3d0Gnwb1",
      "links": [
        [
          "what the fuck",
          "what the fuck#English"
        ]
      ],
      "synonyms": [
        {
          "word": "what the ef"
        }
      ],
      "tags": [
        "euphemistic",
        "form-of"
      ]
    }
  ],
  "word": "what the eff"
}

{
  "etymology_text": "See eff (“fuck”).",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "what the eff",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English euphemisms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2014, Michael Griffo, Starfall (The Darkborn Legacy), New York, NY: Kensington Publishing Corporation, →ISBN, page 94:",
          "text": "“Don't take this the wrong way, Archie,” Arla begins, “but what the ef are you talking about?”",
          "type": "quote"
        }
      ],
      "form_of": [
        {
          "word": "what the fuck"
        }
      ],
      "glosses": [
        "Euphemistic form of what the fuck."
      ],
      "links": [
        [
          "what the fuck",
          "what the fuck#English"
        ]
      ],
      "tags": [
        "euphemistic",
        "form-of"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "what the ef"
    }
  ],
  "word": "what the eff"
}