keister

名词 keister:

1. the fleshy part of the human body that you sit on
   同义词：buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass

keis.ter

n.Slang （名词）【俚语】
The buttocks.
臀，尻
The anus.
肛门

来源：
[Origin unknown]
[词源不详]