A synonym for the water pipe or "Bong" used to smoke cannabis. Used mainly in Sydney, Australia but also in some parts of Western Sydney and is derived from the Australian slang "Billy", also meaning bong. The word "Bilson" can be used as a noun like "bong" is, or as a proper noun like someone's name is for example.
Noun use: "Dude bring the Bilson over here, I want to get ripped!"
Proper Noun use, enquiring into which smoking method will be used during the night: "Hey man is Bilson coming?" "Nah, I reckon we should use blunts instead man". "Bilson's too hard to make tonight".