What is buenos dias mandy?

It is unclear what "buenos dias mandy" refers to as it is a phrase that can be interpreted in different ways. "Buenos días" is a Spanish greeting that means "good morning" in English, while "Mandy" is a name. Therefore, "buenos dias Mandy" could simply be a friendly greeting from one person named Mandy to another, or it could be the title of a book, song, or movie. Without more context, it is difficult to provide more information.