The DICT Development Group

  rear end
      n 1: the fleshy part of the human body that you sit on; "he
           deserves a good kick in the butt"; "are you going to sit on
           your fanny and do nothing?" [syn: buttocks, nates,
           arse, butt, backside, bum, buns, can,
           fundament, hindquarters, hind end, keister,
           posterior, prat, rear, rear end, rump, stern,
           seat, tail, tail end, tooshie, tush, bottom,
           behind, derriere, fanny, ass]

  33 Moby Thesaurus words for "rear end":
     afterpart, afterpiece, back, back door, back seat, back side,
     backside, behind, bottom, breech, butt, buttocks, croup, crupper,
     fanny, haunches, heel, hind end, hind part, hindhead, nates,
     occiput, posterior, postern, rear, rearward, reverse, rump, seat,
     stern, tail, tail end, tailpiece