Neologism derived from the Greek stear esteatos, fat, tallow and pyge - is, back, ass. Excessive accumulation of fat in the buttocks which extends to the thighs and sometimes the lips vulval, genetic trait more prevalent in women, as shown by archaeological remains of up to 30 ago. 000 years and which still manifests itself in some African women ethnic Bushman, Hottentot or Pygmy.