arse

n. ass, buttocks (British Slang); someone who is stupid or repulsive (Offensive, British Slang)

Arse is an English term referring to the buttocks, first recorded circa 1400 (in arce-hoole) and is commonly used in English speaking countries such as the United Kingdom, Ireland, Australia and New Zealand, parts of Canada and former parts of the British Empire. In the United States and parts of Canada the variant form ass is used.
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Noun
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?"
(synonym) buttocks, nates, 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
(hypernym) body part
(part-holonym) torso, trunk, body
2. excretory opening at the end of the alimentary canal
(synonym) anus, arsehole, asshole
(hypernym) orifice, opening, porta
(hyponym) imperforate anus
(part-holonym) rectum
(part-meronym) anal sphincter, sphincter ani, musculus sphincter ani

v. burn, glow, blaze, be on fire, combust; be filled with a strong emotion

adj. dry, thirsty; withered; parched

(n.)
The buttocks, or hind part of an animal; the posteriors; the fundament; the bottom.