Green’s Dictionary of Slang

cackpipe n.

the anus, the rectum.

2003

M. Blackmore Crack of Doom on Bearded Prawn 🌐 And oh God, oh Jesus, his piles! They were a furnace, like a drop of lava in his cackpipe!

In compounds

cackpipe cosmonaut (n.) (also kakpipe cosmonaut)

a male homosexual.

1997		Roger’s Profanisaurus in Viz 87 Dec. n.p.: kakpipe cosmonaut n. One who prefers to dock with the rear unloading bay.
2001		posting 7 Dec. on RalphsSurfShack 🌐 Ed Elgar is a cackpipe cosmonaut.