hindquarter

noun3

1. •
   [in the plural] The hind biped (leg) of a quadruped, or all body parts situated behind the hind legs' trunk-attachment.

   • While Major was speaking four large rats had crept out of their holes and were sitting on their hindquarters, listening to him. — 1943
2. •
   [usually plural] Human behind, butt.
3. •
   Either rear half of a side of beef, mutton, veal, lamb or by extension from another edible mammal.