"j'sais pas quoi" meaning in French

{
  "forms": [
    {
      "form": "j’ sais pas quoi",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "j’sais pas quoi",
      "name": "fr-phrase"
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  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
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          "parents": [],
          "source": "w"
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      "examples": [
        {
          "bold_english_offsets": [
            [
              141,
              150
            ]
          ],
          "bold_text_offsets": [
            [
              154,
              169
            ]
          ],
          "english": "I don't even have a car, you don't have the right to rush at me with your headlights on & wreck my equipment, like I was driving too fast or something!",
          "ref": "2002, Patricia Carroll Cornwell (née Daniels), chapter 17, in L'île des chiens, page 210:",
          "text": "J’ai même pas de bagnole, z’avez pas le droit de me foncer dessus avec vos phares allumés et d’écraser mon matériel, comme si que je roulais trop vite ou j’sais pas quoi !",
          "type": "quote"
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              80
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              76
            ]
          ],
          "english": "I needed to try, otherwise I was going to become an English teacher or something.",
          "ref": "2015 November 10, Marie-Julie Meyssan, Anaïs en concert cet après-midi:",
          "text": "Il fallait que j’essaie, sinon j’allais devenir prof d’anglais ou j’sais pas.",
          "type": "quote"
        }
      ],
      "glosses": [
        "something (literally, “I don't know what”)"
      ],
      "id": "en-j'sais_pas_quoi-fr-phrase-3iuLXZfE",
      "links": [
        [
          "something",
          "something"
        ]
      ],
      "raw_glosses": [
        "(colloquial) something (literally, “I don't know what”)"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʒ‿sɛ pa kwa/"
    },
    {
      "ipa": "/ʒ‿sɛ pɑ kwa/"
    }
  ],
  "word": "j'sais pas quoi"
}

{
  "forms": [
    {
      "form": "j’ sais pas quoi",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "j’sais pas quoi",
      "name": "fr-phrase"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "French colloquialisms",
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French phrases",
        "French terms with IPA pronunciation",
        "French terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
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              141,
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            ]
          ],
          "english": "I don't even have a car, you don't have the right to rush at me with your headlights on & wreck my equipment, like I was driving too fast or something!",
          "ref": "2002, Patricia Carroll Cornwell (née Daniels), chapter 17, in L'île des chiens, page 210:",
          "text": "J’ai même pas de bagnole, z’avez pas le droit de me foncer dessus avec vos phares allumés et d’écraser mon matériel, comme si que je roulais trop vite ou j’sais pas quoi !",
          "type": "quote"
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        {
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            [
              71,
              80
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              76
            ]
          ],
          "english": "I needed to try, otherwise I was going to become an English teacher or something.",
          "ref": "2015 November 10, Marie-Julie Meyssan, Anaïs en concert cet après-midi:",
          "text": "Il fallait que j’essaie, sinon j’allais devenir prof d’anglais ou j’sais pas.",
          "type": "quote"
        }
      ],
      "glosses": [
        "something (literally, “I don't know what”)"
      ],
      "links": [
        [
          "something",
          "something"
        ]
      ],
      "raw_glosses": [
        "(colloquial) something (literally, “I don't know what”)"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ʒ‿sɛ pa kwa/"
    },
    {
      "ipa": "/ʒ‿sɛ pɑ kwa/"
    }
  ],
  "word": "j'sais pas quoi"
}