belly buster noun4 •(slang) A very large meal.The food looks every bit as mouth-watering as the chain's 2,500-calorie belly-buster meals. — 2015 •(slang) A loud, exuberant laugh.Laughter from everyone. Even Mr. Poteet, tired of trying to drill history into the heads of the twins, lets out with a real belly buster. — 2008 •A type of safety harness with a belt that wraps tightly around the belly. •(slang) A poker hand which is four cards to a straight, where only one rank can complete a straight. E.g. 3-4-6-7, only a five completes the straight. formsbelly busters