"fuck if I know" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "2008, Edward Stapleton III, The Believers, Lulu.com, page 42",
          "text": "Hit by a mortar or an M16 round or maybe he was dead years ago...fuck if I know.",
          "type": "quotation"
        },
        {
          "ref": "2008, Harold L. Turley, Born Dying, Simon and Schuster, page 182",
          "text": "Fuck if I know, and honestly, I don't give a shit.",
          "type": "quotation"
        },
        {
          "ref": "2011, Peter Brown Hoffmeister, The End of Boys, Catapult, page 72",
          "text": "Fowler is lying on the floor, switching CDs. He props himself up on his elbow. He says, “You think it'd hurt us though?” I shrug. “Fuck if I know.”",
          "type": "quotation"
        },
        {
          "ref": "2013, Lexi Ryan, Wish I May, Lexi Ryan, page 169",
          "text": "“She's married?” “She's not only married, she's leaving. Or she already left. Fuck if I know.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "I have no idea whatsoever"
      ],
      "id": "en-fuck_if_I_know-en-phrase-dfIYJfkM",
      "raw_glosses": [
        "(vulgar, idiomatic) I have no idea whatsoever"
      ],
      "tags": [
        "idiomatic",
        "vulgar"
      ]
    }
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  "word": "fuck if I know"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "2008, Edward Stapleton III, The Believers, Lulu.com, page 42",
          "text": "Hit by a mortar or an M16 round or maybe he was dead years ago...fuck if I know.",
          "type": "quotation"
        },
        {
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          "text": "Fuck if I know, and honestly, I don't give a shit.",
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        },
        {
          "ref": "2011, Peter Brown Hoffmeister, The End of Boys, Catapult, page 72",
          "text": "Fowler is lying on the floor, switching CDs. He props himself up on his elbow. He says, “You think it'd hurt us though?” I shrug. “Fuck if I know.”",
          "type": "quotation"
        },
        {
          "ref": "2013, Lexi Ryan, Wish I May, Lexi Ryan, page 169",
          "text": "“She's married?” “She's not only married, she's leaving. Or she already left. Fuck if I know.”",
          "type": "quotation"
        }
      ],
      "glosses": [
        "I have no idea whatsoever"
      ],
      "raw_glosses": [
        "(vulgar, idiomatic) I have no idea whatsoever"
      ],
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        "idiomatic",
        "vulgar"
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  "word": "fuck if I know"
}