If something is "cactus", it is broken, doesn't work any more, or another great Australian idiom - "buggered".
Practical application = "Bugger! The motor threw a rod. It's cactus."
Aussie is slang for Australian.
If someone says in Australian slang; " you are cactus mate...." the reference is that you are in a load of trouble, or that your immediate future looks grim. One could say that this is a very lateral thought but the slang concept is based on the fact that Cactus live in the desert, get no water and have a pretty tough existence.
Australian slang for a lady is sheila.
The "correct" Australian slang term is strine.
Common Australian slang for woman is sheila.
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"G'day" IS Australian slang - it's short for "Good Day."
The term yobbo is Australian slang for an uncultivated person.
Australian slang for a toilet is most commonly dunny.
The Australian slang term for girls or women is sheila.
The Australian term (not slang) for French fries is "chips".
"Aussie" is short for "Australian" "Bird" is Australian slang for a girl Thus, an Aussie bird is slang for an Australian girl