1. A deep, loud, unrestrained laugh that comes from the belly or abdomen
The comedian's joke got a belly laugh from the entire audience.
A piada do comediante arrancou uma gargalhada da plateia inteira.
2. Something that is genuinely funny and causes hearty laughter
That slapstick routine was a real belly laugh.
Aquele número de comédia física foi uma verdadeira gargalhada.