(US, childish) gluteus maximus (humorous) glutes (muscles) gooseberry-grinder (archaic, British) heinie (US, childish) hiney (US, childish) hurdies (British)...
or pejorative) crumb crusher (African American Vernacular, slang) crumb grinder (slang, humorous or pejorative) juvenile kid kiddie little one minor moppet...
angol: coffee grinder (en) finn: kahvimylly (fi) francia: moulin à café (fr) német: Kaffeemühle (de) nn orosz: кофемолка (ru) (kofemolka)...