Tennis Buttock

o apple (bottom), referring to the similar shape of the fruit, derived from the 1970s. Also likened to an upside-down heart, attributed from various, popular ads of the '70s.
o caboose, originally a ship's galley in wooden cabin on deck; also the "rear end" car of a freight train, considered a cute synonym suitable for any audience
o cakes
o bottom (and the shortening "bot" as well as childish diminutives "bottie" or "botty"), but the use of similar-sounding booty is artistic liberty