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arse

noun

1.

the fleshy part of the human body that you sit on

hinder hinderling po-po thang ass backside behind bottom bum buns butt buttocks can derriere fanny fundament hind end hindquarters keister nates posterior prat rear rear end rump seat stern tail tail end tooshie tush

Exemplifies:

British English

2.

vulgar slang for anus

arsehole asshole bunghole