Boois is what Joe calls his Orange waterproof jacket ! I have no idea why he calls it Boois or what it means, but he is quite definite about what Boois is ! It’s funny that he seems to make up words for things, but I guess it’s all part of learning language - it’s also quite ingenious - maybe I should try that with French !
Another word is “Tinny” which is anything round, or things that go round, including flashing lights, and cable cars.
“Boois” is what Americans call buoys, which are often orange and necessarily waterproof. Hmmmm….