Coodgybah

The word used to scare someone. It is sometimes used when hiding from somebody and jumping out and scaring them, but it is mainly used when standing next to somebody and shouting 'Coodgybah!' to bring on the element of surprise.

Andrew: "Coodgybah!!"
Aaron: "Arhh FUCK! you scared to shit out of me"

Aaron: "Coodgybah!!"
Kerryn: "Oh my goodness!! Aaron you scared me!!!"

Aaron: "Coodgybah!!"
Ian: "Geeze don't do that to me again!!!"