[object Object] ⌁ The Anglish Wiki

buttocks

noun

1.

the fleshy part of the human body that you sit on

hinder hinderling po-po thang arse ass backside behind bottom bum buns butt 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