"rocks in one's head" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "2007, Don Woodland, Simon Bouda, Picking Up the Pieces:",
          "text": "Fancy bringing all the chaplains together at six o'clock on a Friday night in the heart of Sydney. They've got rocks in their head.",
          "type": "quote"
        },
        {
          "ref": "2009, Robert Arellano, Havana Lunar:",
          "text": "Either that or it's the rocks in your head.",
          "type": "quote"
        },
        {
          "ref": "2013, Alexander Logan, Two Women: Two Worlds, page 313:",
          "text": "They must have rocks in their heads. But then they were young, one of them was only nineteen, and what nineteen year old wouldn't fancy a few virgins after a suicide bombing?",
          "type": "quote"
        },
        {
          "ref": "2019, Virginia Biggar, Lynda Everman, Steven M. Glazer, Dementia-Friendly Worship, page 51:",
          "text": "My mother always said I had rocks in my head, ever since I was a boy, perhaps the yoke of being an Irish American.",
          "type": "quote"
        }
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      "glosses": [
        "An inability to think clearly and rationally."
      ],
      "id": "en-rocks_in_one's_head-en-phrase-AIE0aqyU"
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  "word": "rocks in one's head"
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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          "ref": "2007, Don Woodland, Simon Bouda, Picking Up the Pieces:",
          "text": "Fancy bringing all the chaplains together at six o'clock on a Friday night in the heart of Sydney. They've got rocks in their head.",
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        },
        {
          "ref": "2009, Robert Arellano, Havana Lunar:",
          "text": "Either that or it's the rocks in your head.",
          "type": "quote"
        },
        {
          "ref": "2013, Alexander Logan, Two Women: Two Worlds, page 313:",
          "text": "They must have rocks in their heads. But then they were young, one of them was only nineteen, and what nineteen year old wouldn't fancy a few virgins after a suicide bombing?",
          "type": "quote"
        },
        {
          "ref": "2019, Virginia Biggar, Lynda Everman, Steven M. Glazer, Dementia-Friendly Worship, page 51:",
          "text": "My mother always said I had rocks in my head, ever since I was a boy, perhaps the yoke of being an Irish American.",
          "type": "quote"
        }
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        "An inability to think clearly and rationally."
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  "word": "rocks in one's head"
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