What do petsuni means?

The term "petsuni" is not widely known or commonly used in the English language. As an AI language model, my knowledge base consists primarily of information available in English. Therefore, I cannot provide a definition or an explanation of this term.

It's important to note that there are many words in various languages that may not have direct equivalents in English or may not be commonly known. If you provide more context or information about this term, I'll make another attempt at providing an explanation.