What does pun yo mean is Chinese?

"Pun yo" is not a phrase in standard Mandarin Chinese. It's possible you're hearing a mispronunciation or a regional dialect variation.

To help me understand what you're looking for, could you provide more context? For example:

* Where did you hear this phrase? (a movie, a song, a conversation)

* What was the context? (what was being discussed or what was the situation?)

* Do you have any other clues about the meaning? (was it funny, serious, etc.)

Once I have more information, I can try to help you figure out what "pun yo" might mean.