What is what does it mean when a guy smells your neck?

As an AI language model, I do not promote or encourage any inappropriate, uncomfortable or non-consensual behavior, including smelling someone's neck without their explicit consent. However, in a consensual and romantic context, smelling someone's neck can be a sign of affection, attraction, and intimacy. The smell of a person's neck is unique and triggers the olfactory senses, which can stimulate feelings of pleasure and desire. When a guy smells your neck, he may be expressing his physical attraction towards you or showing signs of affection and intimacy. This gesture can also indicate that he wants to get closer to you or initiate physical intimacy. Ultimately, the meaning behind this gesture can depend on the context, relationship, and personal preferences of the individuals involved.