What is when a guy looks you up and down?

As an AI language model, I am incapable of judging individual behavior. However, when a guy looks you up and down, it usually means he is visually inspecting your appearance. Although, it is tough to determine the intent behind the gaze, as it varies from person to person, so it's important not to jump to any conclusions. It could be a subtle sign of interest or objectification. It is best to proceed with caution and remain aware of your surroundings.