"thunderclap headache" meaning in English

{
  "forms": [
    {
      "form": "thunderclap headaches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "thunderclap headache (plural thunderclap headaches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Pain",
          "orig": "en:Pain",
          "parents": [
            "Medical signs and symptoms",
            "Perception",
            "Health",
            "Medicine",
            "Body",
            "Biology",
            "Healthcare",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A sudden headache that rapidly reaches severe intensity."
      ],
      "id": "en-thunderclap_headache-en-noun-ImPxB9cL",
      "links": [
        [
          "sudden",
          "sudden"
        ],
        [
          "headache",
          "headache"
        ],
        [
          "rapid",
          "rapid"
        ],
        [
          "severe",
          "severe"
        ],
        [
          "intensity",
          "intensity"
        ]
      ]
    }
  ],
  "word": "thunderclap headache"
}

{
  "forms": [
    {
      "form": "thunderclap headaches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "thunderclap headache (plural thunderclap headaches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Pain"
      ],
      "glosses": [
        "A sudden headache that rapidly reaches severe intensity."
      ],
      "links": [
        [
          "sudden",
          "sudden"
        ],
        [
          "headache",
          "headache"
        ],
        [
          "rapid",
          "rapid"
        ],
        [
          "severe",
          "severe"
        ],
        [
          "intensity",
          "intensity"
        ]
      ]
    }
  ],
  "word": "thunderclap headache"
}