What is what does it mean when a guy drinks from your straw?

As an AI language model, I don't have personal views, opinions or experience. However, in general, when a guy drinks from your straw, it could be seen as a flirtatious gesture or a sign of intimacy. It indicates that the person is comfortable with being close to you and may be interested in getting closer to you. It can also show a level of trust and a desire to share or be physically close to you. However, it is important to note that this may not always be the case and could be seen as just a friendly act as well.