crease; crease up verb to laugh immoderately, to collapse with laughter; to cause such a condition UK,1984 An image of being bent double with laughter.
[T]he first fight was played out and they again creased with laughter. — GuardianUnlimited, 1 February 2001
[H]is younger brother would make cutting jokes–things which Ian interpreted as genuinely rude–and have everyone creased up with laughter. — TheObserver, 20 May 2001