Tennis Buttock

• butt - the common term for a pair of buttocks (singular, as one body-part; cognate but neither its root nor an abbreviation) in the US, used in everyday speech. It is also acceptable in print.
• can (a container) had an unusual development: the slang meaning "toilet" is recorded circa 1900, said to be a shortening of piss-can, the meaning "buttocks" from c. 1910, verb meaning "fire an employee" (to flush=dump) from 1905.
• cheeks, a shape-metaphor within human anatomy, but also used in the singular: left cheek and right cheek; sounds particularly naughty because of the homonym and the adjective cheeky, lending themselves to word puns
• culo - (From Spanish/Italian) slang, usually meaning a woman's voluptuous, round and firm buttocks. Put simply the Latino equivalent of booty, although in Spanish it is considered vulgar and offensive (but less so in Spain than in Latin America).