I believe Sparky got the right definition. I wonder what Americans may have thought about it when they heard it as he repeats it a few times. Who is Sydney and what exactly is the term the bush defined in America. Isn't it brushfire, not bushfire? Shulz must have had some fascination with Australia. I think they are some other references. I know Snoopy imitates a kangaroo, and there is that phrase. "It's not the end of the world Charlie Brown. It's already tomorrow in Australia."