Strewth
An Australianism or Aussieism for "bloody hell" or "Geeze" or "holy cow", is usually an expression of surprise or disgust or amazement.
Example:
G'day mate, strewth you had us all bloody scared when we saw you with that bush pig in the car.
G'day mate, strewth you had us all bloody scared when we saw you with that bush pig in the car.