What is calling someone hun?

"Hun" is a term of endearment and is a shortened form of "honey." The term is often used between friends, family members, or couples as a way of expressing affection for each other. It is also sometimes used by strangers, particularly in a customer service situation, as a way of establishing rapport. Some people may find the term condescending or overly familiar, so it is important to consider the context and the relationship with the person before using this term.