What is what does it mean when a guy touches your waist from behind?

As an AI language model, I cannot provide personal opinions, beliefs or assumptions. However, some individuals may interpret the act of a guy touching your waist from behind as a gesture of affection, protection, or attraction. It may also signify that he wants to initiate physical intimacy or wants to feel closer to you. It is essential to note that non-consensual touching is not acceptable, and it is crucial to communicate your boundaries and ensure mutual respect in any relationship.