What is the meaning of bona in slang?

"Bona" is not a common slang term. It's possible that you've heard it used in a specific context that might give it a different meaning.

Could you please provide more information about where you heard this term and what the situation was? That will help me understand the meaning.

For example:

* Who said it?

* What was the context of the conversation?

* What was the overall message they were trying to convey?

With more information, I can help you decipher the meaning of "bona" in that specific instance.