Bum cheeks is the very British, and fairly plain-spoken, way to refer to the buttocks — specifically the two rounded halves of them. It's informal without being particularly rude, the kind of phrase a British parent might use with a toddler or that turns up in light comedy sketches. Less crude than some alternatives, more direct than 'posterior' — bum cheeks sits comfortably in everyday casual British English as an anatomically accurate but not overly clinical description.
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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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He forgot to check the back of his jeans before leaving the house — there was a hole right across both bum cheeks.
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(UK, informal) Buttocks.
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