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A person or thing that is super Australian. They talk like they just woke up from a bar fight and they act like they own the outback. Usually used to tease someone. Think of it like the Aussie version of a bogan, but with better manners and worse hygiene.
"You’re the occa of the century," said my cousin after I tried to explain what a 'barbie' was."
"Why’d you move here? You’re not even occa!" I yelled at my neighbor who tried to speak English.
"This occa just tried to convince me Vegemite is a food, not a punishment."