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When you have been sitting down for a prolonged period of time, so the base of one's arse cheeks become flat, so it resembles an upturned Kit kat
"I've been sitting here for seven fucking hours man"
"I bet you have a right Kit Kat arse!"
by Barclay teh Great March 07, 2009

Words related to Kit Kat Arse

arse ass bum butt kit kat sitting