ringpiece

Ringpiece is British slang for the anal sphincter — the ring-shaped muscle at the, shall we say, exit. It's crude but not aggressive, the kind of anatomical slang that pops up in British comedy, locker room talk, and irreverent conversation. Compared to more aggressive alternatives, ringpiece has an almost cheerful bluntness — it describes what it describes without pretending to be anything fancier. Common in UK English and recognizable across the English-speaking world to anyone who's watched enough British sitcoms.