"go mental" meaning in English

{
  "forms": [
    {
      "form": "goes mental",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "going mental",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "went mental",
      "tags": [
        "past"
      ]
    },
    {
      "form": "gone mental",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "go<goes,,went,gone> mental"
      },
      "expansion": "go mental (third-person singular simple present goes mental, present participle going mental, simple past went mental, past participle gone mental)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "_dis": "89 11",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "Her father went mental when he found out that she was pregnant."
        }
      ],
      "glosses": [
        "To become extremely angry."
      ],
      "id": "en-go_mental-en-verb-R~1P6inQ",
      "raw_glosses": [
        "(informal) To become extremely angry."
      ],
      "tags": [
        "informal"
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "text": "When the band came on stage, the crowd went mental."
        }
      ],
      "glosses": [
        "To become wild with excitement."
      ],
      "id": "en-go_mental-en-verb-uiH21Fic",
      "raw_glosses": [
        "(informal) To become wild with excitement."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "go mental"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English verbs"
  ],
  "forms": [
    {
      "form": "goes mental",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "going mental",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "went mental",
      "tags": [
        "past"
      ]
    },
    {
      "form": "gone mental",
      "tags": [
        "participle",
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "go<goes,,went,gone> mental"
      },
      "expansion": "go mental (third-person singular simple present goes mental, present participle going mental, simple past went mental, past participle gone mental)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English informal terms"
      ],
      "examples": [
        {
          "text": "Her father went mental when he found out that she was pregnant."
        }
      ],
      "glosses": [
        "To become extremely angry."
      ],
      "raw_glosses": [
        "(informal) To become extremely angry."
      ],
      "tags": [
        "informal"
      ]
    },
    {
      "categories": [
        "English informal terms"
      ],
      "examples": [
        {
          "text": "When the band came on stage, the crowd went mental."
        }
      ],
      "glosses": [
        "To become wild with excitement."
      ],
      "raw_glosses": [
        "(informal) To become wild with excitement."
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "word": "go mental"
}