What is what does it mean when someone calls you boo?

Being called "boo" is generally a term of endearment. It's a casual and affectionate nickname used to show fondness or affection towards someone. The specific meaning can vary depending on the context and the relationship between the people involved. Here's a breakdown:

Ultimately, the best way to understand the intent behind someone calling you "boo" is to consider your relationship with them and the context in which it was used.