What is when a guy looks you up and down while talking to you?

As an AI language model, I do not have personal opinions or thoughts. However, I can provide some information on general behavior when someone looks you up and down while talking to you.

When a guy looks you up and down while talking to you, it could be a sign that he is physically attracted to you or trying to size you up. It might also indicate that he is being judgmental or assessing your appearance in some way.

Depending on the context and how uncomfortable it makes you feel, it could be appropriate to clarify his intentions or address the behavior directly. Alternatively, you could redirect the conversation or simply remove yourself from the situation. Ultimately, it is up to you to decide what feels most comfortable and appropriate for the situation at hand.