"nemít šajnu" meaning in Czech

{
  "head_templates": [
    {
      "args": {},
      "expansion": "nemít šajnu ?",
      "name": "cs-verb"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "I have no idea.",
          "text": "Nemám šajnu.",
          "type": "example"
        }
      ],
      "glosses": [
        "to have no idea"
      ],
      "id": "en-nemít_šajnu-cs-verb-2qyVLWGt",
      "links": [
        [
          "idea",
          "idea"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, informal) to have no idea"
      ],
      "synonyms": [
        {
          "word": "nevědět"
        }
      ],
      "tags": [
        "idiomatic",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nɛmiːt ʃajnu]"
    }
  ],
  "word": "nemít šajnu"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "nemít šajnu ?",
      "name": "cs-verb"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "Czech entries with incorrect language header",
        "Czech idioms",
        "Czech informal terms",
        "Czech lemmas",
        "Czech multiword terms",
        "Czech terms with IPA pronunciation",
        "Czech terms with usage examples",
        "Czech verbs",
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for aspect in Czech entries"
      ],
      "examples": [
        {
          "english": "I have no idea.",
          "text": "Nemám šajnu.",
          "type": "example"
        }
      ],
      "glosses": [
        "to have no idea"
      ],
      "links": [
        [
          "idea",
          "idea"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, informal) to have no idea"
      ],
      "tags": [
        "idiomatic",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[nɛmiːt ʃajnu]"
    }
  ],
  "synonyms": [
    {
      "word": "nevědět"
    }
  ],
  "word": "nemít šajnu"
}