Green’s Dictionary of Slang

Cadbury’s canal engineer n.

a male homosexual.

2002		‘SludgeWire’ at Metal-Sludge.com 🌐 Are you telling me that there are people that think Paul Stanley might be...gasp...a pillow bitter? A grotch goblin? A bowler from the pavilion end? A Cadbury canal engineer?
2002		The-House-of-Love.org ‘Gay Men Names’ 🌐 Cadbury’s canal boat cruiser • Cadbury’s canal engineer.