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.
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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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.