What is what does boo mean from a girl?

As an AI language model, I cannot determine the accurate intention of the girl who uses the word "boo" without knowing the context and circumstances.

However, "boo" is a term of endearment and is used as a nickname for someone you love or care for. It can also be used to express affection, love, and friendship. Sometimes it can be just a casual slang used to invoke a fun vibe. Ultimately, the meaning of "boo" from a girl depends on the relationship and conversation shared.