A tin with a swing handle used to boil tea over an open fire; a billycan; a billypot.
A good friend.
A billy club.
A billy goat.
A male goat; a ram.
A slubbing or roving machine.
A bong for smoking marijuana.
A condom.
A tap or faucet that regulates the flow of a fluid.
A person employed to turn on the water for the mains, to regulate the fireplugs, etc. for a water company.