What is the meaning of gangsa topayya?

"Gangsa topayya" is not a recognized phrase in any language. It seems like it might be a misspelling or a made-up phrase.

Could you please provide more context or clarify what you mean?

For example:

* Where did you hear this phrase?

* What language is it in?

* What was the context of the phrase?

With more information, I can help you understand the meaning.