Green’s Dictionary of Slang

the rectal passage.

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: Cadbury Alley n. See Bourneville Boulevard.
2000		Drew Journal on Drew.corrupt.net 🌐 The sight of a skinny college kid running down the street with no shirt, scared that I will try to put my carrot in his cadbury canal after taking off his shirt, is even funnier.