No, I haven't heard anyone use fair dinkums before other than in Australian novels. Although I'm pretty sure that it is still used by some people - just not the people I am acquainted with.
Haha, have you found out what 'dude' is? It's a very common slang for: you, guy, person. i.e. 'Hey dude!' roughly means 'Hey you!'
I found your message very entertaining.
It brought to light how much of my daily life I take for given. I always thought that the slang I spoke was universal English slang ^^. I actually needed quite some time to think of what I use that is labelled 'slang'...I use it without thinking! It's become the normal English to me.
Some slang:
It was hectic/awesome = It was cool; Ace = very good; That was mad! = that was great!; Aussie = English; AZN = asian; break wind (this is not very appropriate for purposes of ithis message but it is used so I put it in anyway) = to fart
Wacko = crazy/crazy person
Brekkie = Breakfast >> Yes we do make a lot of words shorter!
BBQ = Barbie
Chocolate = Choc
Kindergarten = Kindy
Mcdonalds = Maccas
>> We have our own personal preferences. Some people say 'toilet', others say 'restroom', 'bathroom' and 'loo'. We are generally very direct in our language so we mostly use 'toilet'.
I once asked my teacher if 'I could go to the bathroom', but he corrected me by saying that there was not bath there! There's no better phrase, I think it all comes down to personal opinions. =D
>> Yes we use oopsie (you've spelt it right), whoops and oops. I've heard some guys use it too. Its most basic use (and the only one I can think of) is when we notice a clumsy mistake e.g. I spelt a word wrong and automatially say 'oops' or any of its other alternatives.
There's also 'whoopsie daisy' which is used in the same way.
I really enjoyed your questions! C ya