"Millwall brick" meaning in English

{
  "etymology_text": "In reference to Millwall F.C., a football club with a reputation for hooliganism.",
  "forms": [
    {
      "form": "Millwall bricks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Millwall brick (plural Millwall bricks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An improvised club-like weapon made of tightly rolled and bent newspaper, allegedly used by football hooligans."
      ],
      "id": "en-Millwall_brick-en-noun-aWe~-3tH",
      "links": [
        [
          "improvised",
          "improvised"
        ],
        [
          "club",
          "club"
        ],
        [
          "weapon",
          "weapon"
        ],
        [
          "newspaper",
          "newspaper"
        ],
        [
          "football hooligan",
          "football hooligan"
        ]
      ],
      "raw_glosses": [
        "(UK, slang) An improvised club-like weapon made of tightly rolled and bent newspaper, allegedly used by football hooligans."
      ],
      "tags": [
        "UK",
        "slang"
      ],
      "wikipedia": [
        "Millwall F.C."
      ]
    }
  ],
  "word": "Millwall brick"
}

{
  "etymology_text": "In reference to Millwall F.C., a football club with a reputation for hooliganism.",
  "forms": [
    {
      "form": "Millwall bricks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Millwall brick (plural Millwall bricks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English slang"
      ],
      "glosses": [
        "An improvised club-like weapon made of tightly rolled and bent newspaper, allegedly used by football hooligans."
      ],
      "links": [
        [
          "improvised",
          "improvised"
        ],
        [
          "club",
          "club"
        ],
        [
          "weapon",
          "weapon"
        ],
        [
          "newspaper",
          "newspaper"
        ],
        [
          "football hooligan",
          "football hooligan"
        ]
      ],
      "raw_glosses": [
        "(UK, slang) An improvised club-like weapon made of tightly rolled and bent newspaper, allegedly used by football hooligans."
      ],
      "tags": [
        "UK",
        "slang"
      ],
      "wikipedia": [
        "Millwall F.C."
      ]
    }
  ],
  "word": "Millwall brick"
}