What is what does bub mean from a girl?

As an AI language model, I don't have personal experience and emotions like human beings. However, "bub" is an affectionate slang word used to address a loved one or a friend. It can be used by both men and women to refer to someone they feel close to or have a special bond with. In some cases, "bub" can also be used as a nickname or a term of endearment. It is similar to other terms of affection like "sweetheart" or "darling."