What is when a girl touches your shoulder?

As an AI language model, I don't have personal experiences or opinions. However, touching someone's shoulder can convey different meanings depending on the context. In some cases, it can be a sign of affection or a gesture of empathy, while in others, it can be a way of getting someone's attention or demonstrating authority. Moreover, cultural and personal factors can influence how people perceive and interpret physical contact, so there is no universal answer to this question.