düzgün kalçalı

listen to the pronunciation of düzgün kalçalı
Турецкий язык - Английский Язык
(Konuşma Dili) callipygian
Having beautifully shaped buttocks

and the term you want is callipygian you cow.

Having a beautiful rear end
{s} having firm and beautifully shaped buttocks, having shapely buttocks; of or pertaining to firm and shapely buttocks
pertaining to or having finely developed buttocks; "the quest for the callipygian ideal