Tennis Buttock

o trunk, in American English, particularly when describing large buttocks "junk in the trunk"
• arse or ass, arsehole or asshole, and (butt-)hole - a pars pro toto (strictly only the actual body cavity and directly adjoining anal region); also used as an insult for a person. The term is Anglo-Saxon dialect, and over a thousand years old.
• badonkadonk - onomatopoeic slang meaning the voluptuously bouncing, large yet firm buttocks of a woman