Green’s Dictionary of Slang

(US) the anus.

1998		‘Bill E. Goodhead’ Nubile Treat 🌐 She was holding her asscheeks apart so that he could see her pussy and her tight little tailpipe.
2006		ad for Drilled and Filled [DVD] at www.videobox.com 🌐 Her once-tight little tailpipe is left raw, sore and whistling in the wind.