Tennis Buttock

• 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
• biscuits
• breech, a metaphorical sense derived from on older form of the garment breeches (as the French culotte meaning pantoloons, via cul from Latin culus 'butt'), so 'bare breech' means without breeches, i.e. trouserless butt