Austrian, can basically mean anything. Some examples are: dude, damn, ew, yayy, amazing, wow, omg, oh man, *being surprised*, stop that, you're so hot, *not understanding sth*, wtf,...
Oida, you're hot.
Oida, look at that hot girl.
Oida, this is an amazing view.
Oida, it stinks.
Oida, stop looking at my boobs.
Oida, why is maths so complicated.
Oida, I got the best job ever.
Oida, thank you for that present