What is what does it mean when a guy calls you bub?

When a guy calls you "bub", it is usually a term of endearment used to refer to someone he is close to or someone he likes. The term is often used among friends and family members to show affection, but it can also be used between romantic partners. It is a playful way to address someone and can indicate a level of comfort and familiarity in the relationship. However, it is important to note that the meaning of the term may vary depending on the context and relationship between the two individuals.