"are you sure you're sure" meaning in English

{
  "etymology_text": "Popularized by SpongeBob SquarePants in the show of the same name's episode \"Hide and Then What Happens?\", where he asks Mrs. Puff multiple times if she's sure she won't help him hide.",
  "head_templates": [
    {
      "args": {
        "1": "phr"
      },
      "expansion": "are you sure you're sure",
      "name": "en-head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Internet memes",
          "orig": "en:Internet memes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "SpongeBob SquarePants",
          "orig": "en:SpongeBob SquarePants",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2010 August 9, Aaron Springer, Dani Michaeli, Andrew Overtoom, “Hide and Then What Happens?”, in SpongeBob SquarePants",
          "text": "SpongeBob: Are you sure?\nMrs. Puff: Yes.\nSpongeBob: Are you sure you're sure?\nMrs. Puff: Yes.\nSpongeBob: Are you sure you're sure you're sure?\nMrs. Puff: Yes, I'm sure!",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A way to ask if someone is certain about something."
      ],
      "id": "en-are_you_sure_you're_sure-en-phrase-mnmBgjyr",
      "raw_glosses": [
        "(humorous) A way to ask if someone is certain about something."
      ],
      "tags": [
        "humorous"
      ]
    }
  ],
  "word": "are you sure you're sure"
}

{
  "etymology_text": "Popularized by SpongeBob SquarePants in the show of the same name's episode \"Hide and Then What Happens?\", where he asks Mrs. Puff multiple times if she's sure she won't help him hide.",
  "head_templates": [
    {
      "args": {
        "1": "phr"
      },
      "expansion": "are you sure you're sure",
      "name": "en-head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English humorous terms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Internet memes",
        "en:SpongeBob SquarePants"
      ],
      "examples": [
        {
          "ref": "2010 August 9, Aaron Springer, Dani Michaeli, Andrew Overtoom, “Hide and Then What Happens?”, in SpongeBob SquarePants",
          "text": "SpongeBob: Are you sure?\nMrs. Puff: Yes.\nSpongeBob: Are you sure you're sure?\nMrs. Puff: Yes.\nSpongeBob: Are you sure you're sure you're sure?\nMrs. Puff: Yes, I'm sure!",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A way to ask if someone is certain about something."
      ],
      "raw_glosses": [
        "(humorous) A way to ask if someone is certain about something."
      ],
      "tags": [
        "humorous"
      ]
    }
  ],
  "word": "are you sure you're sure"
}