WordWeb Online

1. The fleshy part of the human body that you sit on
   - buttocks, nates, butt, backside, bum, buns [N. Amer], can [N. Amer], fundament, hindquarters, hind end, posterior, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush [N. Amer], bottom, behind, derriere, heinie [US], derrière
    
2. Vulgar slang for anus
   - bunghole

1. Be bothered to do something
   "I'll do it when I can be arsed"; "can't be arsed"

Derived forms: arsed, arsing, arses

Type of: anus, body part

Part of: body, torso, trunk

Encyclopedia: Arse