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

When a guy calls you sis, it means that he considers you as a sister, typically as a term of endearment or a way to express closeness without romantic intentions. It could also be a way to signal that the relationship is purely platonic and not romantic in nature. While the term may vary depending on the context, such as in a sibling or close friend relationship, it typically conveys a level of trust, respect, and comfort in each other's company.