rump

(noun) the part of an animal that corresponds to the human buttocks. Synonyms: hindquarters, croup, croupe.

(noun) fleshy hindquarters; behind the loin and above the round.

(noun) the fleshy part of the human body that you sit on. 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. Examples: "He deserves a good kick in the butt." "Are you going to sit on your fanny and do nothing?."