steatopygous UK /ˌstɪ.əˈtɒ.pɪ.ɡəs/US /ˌstɪ.əˈtɑ.pɪ.ɡəs/ adjective1 •Pertaining to steatopygia; having fat or prominent buttocks.At his side, Amuta and a steatopygous twelve-year-old in a striped shift. — 1981 formsmore steatopygous · most steatopygous