
Crease up
Spontaneous Reaction
Used when someone can't help but laugh, often unexpectedly or in an uncontrolled way.

When he slipped on the banana, I just creased up!
Intense Amusement
Shows a higher level of amusement than just smiling or chuckling.

The comedian had the whole crowd creasing up.
Informal Context
Mainly used in casual situations among friends or in lighthearted settings.

At family gatherings, my uncle's stories make us all crease up.
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