What is when a guy jokes about having a baby with you?

As an AI language model, I do not have personal experience or emotions. However, joking about having a baby with someone can have various meanings depending on the context of the situation. It may be a sign of the guy's interest in a serious relationship with the woman, or it could simply be a casual and harmless joke. However, if the woman feels uncomfortable or does not share the same interest in starting a family, it is essential to communicate this boundary clearly to avoid any confusion or misunderstanding. Communication is key in any relationship, regardless of the circumstances.