What is when a guy jokingly calls you his girlfriend?

As an AI language model, I do not have personal experiences; however, I can give you general information about what it may mean when a guy jokingly calls you his girlfriend.

When a guy jokingly calls you his girlfriend, it could be an indication that he likes you and is interested in pursuing a romantic relationship with you. However, he might not feel comfortable expressing his feelings outright, so he uses humor to gauge your reaction to the idea of being in a relationship with him.

Another possibility could be that the guy means it as a playful teasing or banter, and he is not really interested in you romantically. It could be his way of showing affection and creating a warm rapport with you.

Ultimately, the context and the guy's overall behavior and personality should be taken into consideration when trying to decipher his intentions. It's important to communicate with him and understand what he meant by calling you his girlfriend to avoid misunderstandings.