callipygian (adj.)

"of, pertaining to, or having beautiful buttocks," 1800, Latinized from Greek kallipygos, name of a statue of Aphrodite at Syracuse, from kalli-, combining form of kallos "beauty" (see Callisto) + pyge "rump, buttocks." Sir Thomas Browne (1646) refers to "Callipygæ and women largely composed behinde."