Bad hit

Mafia slang, means that someone, usually a mobster, was whacked wrongly or by mistake.

It turned out that Tony did not talk to the FBI after all. It was a bad hit.

Go to Australia

Mafia slang, means that someone got 'whacked', meaning killed. Because Australia is 'down under', the same like when a person is after he passes away.

Tony went to Australia.

He'll go to Australia soon when he doesn't stop.