What is when a guy checks you out?

As an AI language model, I do not have personal experiences or observations to share. However, it is commonly believed that when a guy checks you out, he may glance at you from head to toe, make eye contact, and may have a suggestive or appreciative expression on his face. This may indicate that he finds you physically appealing or attractive. However, it is important to remember that checking someone out without their consent can be inappropriate and disrespectful behavior. Respect for boundaries and mutual consent are essential in any social interaction.