roar of laughter; explosive laughter; uproarious laughter
Emphasizes a very loud, collective burst of laughter, often from a group. Commonly used in phrases like 大爆笑する or 大爆笑が起こる.
The venue was filled with a roar of laughter at his joke.
The whole family burst into explosive laughter watching that video.
Compound of 大 (だい, 'big') + 爆笑 (ばくしょう, 'burst of laughter'). The exact origin is uncertain, but it follows a common pattern of intensifying a noun with 大.