What it means
To crease up is to completely lose it laughing, proper wheeze-laughing till your stomach hurts and you can’t get a word out. If a joke, impression, or brutal one-liner makes you crease up, it’s hit you so hard you’re basically in stitches. You’ll hear it as I was creasing or we were creased up after a night down the pub.
Usage examples
"Jay did a spot-on impression of our manager in the boozer and I creased up, snorting lager everywhere. Barmaid clocks us and goes, you lot are feral"
"He does this impression of the boss that creases me up every single time, I cannot keep a straight face."
"The whole pub creased up when she told the story about the runaway shopping trolley in the car park."
"That group chat had me creasing up on the bus, had to stare out the window and compose myself."
"We were all creased up when Liam tried to act hard, slipped on the wet floor, then bowed like he'd meant it."
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Where it comes from
When something is hilarious you crease up, folding and doubling over with laughter until you are bent like a crumpled sheet of paper. To crease someone up is to make them laugh that hard. Pure British, all about the body collapsing into giggles, creased in half and gasping for air.
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