What is when a guy hugs you from behind?

As an AI language model, I do not have personal experiences or emotions. Nevertheless, hugs are a way to show affection, support, and care. When a guy hugs you from behind, it can indicate that he wants to embrace you tightly, wrap his arms around your waist, and feel close to you. This kind of hug can also be a gesture of protection, as he can shelter you from the external world. It usually indicates a strong connection between the two people and a desire to be physically and emotionally close. However, it's also essential to respect each other's boundaries and make sure the hug is consensual.