"billion laughs" meaning in English

{
  "etymology_text": "In the most frequently cited example of such an attack, the first entity is the string lol (“laugh out loud”).",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "billion laughs pl (plural only)",
      "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"
        },
        {
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Computer security",
          "orig": "en:Computer security",
          "parents": [
            "Computing",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2016, Prakhar Prasad, Mastering Modern Web Penetration Testing, Packt Publishing Ltd, →ISBN, page 193:",
          "text": "The XML billion laughs DoS attack simply starts by declaring an XML document with an entity named lol (hence the name laugh gets associated with it, but in a general case it can be any valid name).",
          "type": "quote"
        }
      ],
      "glosses": [
        "A type of denial-of-service attack which is aimed at parsers of XML documents, based on defining entities that expand to large numbers of copies of other entities."
      ],
      "id": "en-billion_laughs-en-noun-eEa2Gg2g",
      "links": [
        [
          "computer security",
          "computer security"
        ],
        [
          "denial-of-service attack",
          "denial-of-service attack"
        ],
        [
          "parser",
          "parser"
        ],
        [
          "XML",
          "XML"
        ],
        [
          "entities",
          "entity"
        ],
        [
          "expand",
          "expand"
        ]
      ],
      "qualifier": "computer security",
      "raw_glosses": [
        "(computer security) A type of denial-of-service attack which is aimed at parsers of XML documents, based on defining entities that expand to large numbers of copies of other entities."
      ],
      "related": [
        {
          "word": "XML bomb"
        }
      ],
      "tags": [
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "billion laughs attack"
      ]
    }
  ],
  "word": "billion laughs"
}

{
  "etymology_text": "In the most frequently cited example of such an attack, the first entity is the string lol (“laugh out loud”).",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "billion laughs pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "XML bomb"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Computer security"
      ],
      "examples": [
        {
          "ref": "2016, Prakhar Prasad, Mastering Modern Web Penetration Testing, Packt Publishing Ltd, →ISBN, page 193:",
          "text": "The XML billion laughs DoS attack simply starts by declaring an XML document with an entity named lol (hence the name laugh gets associated with it, but in a general case it can be any valid name).",
          "type": "quote"
        }
      ],
      "glosses": [
        "A type of denial-of-service attack which is aimed at parsers of XML documents, based on defining entities that expand to large numbers of copies of other entities."
      ],
      "links": [
        [
          "computer security",
          "computer security"
        ],
        [
          "denial-of-service attack",
          "denial-of-service attack"
        ],
        [
          "parser",
          "parser"
        ],
        [
          "XML",
          "XML"
        ],
        [
          "entities",
          "entity"
        ],
        [
          "expand",
          "expand"
        ]
      ],
      "qualifier": "computer security",
      "raw_glosses": [
        "(computer security) A type of denial-of-service attack which is aimed at parsers of XML documents, based on defining entities that expand to large numbers of copies of other entities."
      ],
      "tags": [
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "billion laughs attack"
      ]
    }
  ],
  "word": "billion laughs"
}