| Noun | 1. | rear end - 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?"arse, ass, behind, buns, buttocks, hind end, hindquarters, keister, nates, posterior, prat, derriere, fanny, tooshie, tush, fundament, seat, backside, bottom, stern, rump, tail end, tail, rear, bum, can, butt body part - any part of an organism such as an organ or extremity |