Short for Courtesy Wave. Basically, any time a stranger shows you some Courtesy, a car lets you in traffic, chuck em a Courto Wave, A bloke lets you in the line, give em a Courto Wave. A bloke waits for your to reverse out of a carpark without blocking you in like a fuckwit, give them a Courto Wave. It's the right thing to do. It's unaustralian not to.
When you let someone in traffic, you have to give them a Courto Wave, if you don't your a cunt. It's as bad as not returning your trolley.
When a friend of the opposite sex (for heterosexuals) wears something slightly revealing or otherwise shows a bit of skin, and it would be rude or confidence destroying not to take a quick glance.
When you are watching a movie with a bro and a sad part comes up. Your bro begins to cry so you throw your drink in their face so no one can see that he is crying.
One who attends the Courtauld Insitute of Art, London.
Typically have significant pyschological problems and a propensity to drink excessive amounts of gin.