What is the meaning of rump?

noun

• The part of an animal that corresponds to the human buttocks.
  • synonyms: hindquarters, croup, croupe
• Fleshy hindquarters; behind the loin and above the round.
• The fleshy part of the human body that you sit on.
  • usage: "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing"
  • synonyms: buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass