callipygian: having well-shaped buttocks

“of, pertaining to, or having beautiful buttocks,” 1800, Latinized from Greek kallipygos, the name of a statue of Aphrodite at Syracuse, from kalli-, combining form of kallos “beauty” (see Callisto) + pygē “rump, buttocks,” which Beekes calls “A slang word, completely avoided in epic poetry and higher literature (Wackernagel 1916: 225f.). It has no convincing etymology.” Sir Thomas Browne (1646) refers to “Callipygæ and women largely composed behinde.”