The term "Bathroom" is used basically to only apply to a room that actually has a bath (or alternatively a shower, or both) in it.  For the toilet, we call it a list of things...toilet, dunny, the John, shithouse, commode, essentially any name it has except for bathroom.  Curse words are generally the same, although we do have a couple of them that soften the blow.  "Bugger", while still rude, is notably less rude than some other words.  For a full list of Australian slang, check out this page, it has a lot of things to help.
But since Steve Irwin, no normal Australian has used the word "Crikey".

Thanks for the link.  Fantastic!