We also use "bem capaz", which literally means "very capable", to mean "of course not!"
People from the rest of the country, trying to make sense of what to their ears sounds like a sentence fragment, often assume it to be a shortening of "é bem capaz que sim", which means "it's quite possible that yes", which means the exact opposite!
When you ask someone from my state what "capaz"/"capable" means, they tell you with a smile: "capaz que não"/"it's capable that no"
The person will invariably then say, somewhat puzzled: "oh, so it means 'possibly not', then??"
"No, it means 'definitely not'!"
It comes to mind now also that we also use it as a possible answer for obrigado/"thank you", say, if you do someone a favor, as a way of saying "nevermind, it was no hassle!"
And now I can't help but find this exchange hilarious:
— thank you!
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