ほうふくぜっとう
laughing oneself into convulsions; splitting one's sides laughing; rolling with laughter
Also written 捧腹絶倒
Noun, Suru verb, Intransitive, No-adjective
彼かれのドジ話はなしを聞きいて、皆みな、抱腹絶倒ほうふくぜっとうした。
He had everyone howling with his stories of all his past bloopers.