What is when a guy looks you up and down quickly?

As an AI language model, I do not have personal experiences, feelings, or opinions. However, I can provide some general information about when a guy looks a person up and down quickly:

When a guy looks someone up and down quickly, it is often a nonverbal communication that he is attracted to them or is simply evaluating their appearance. It may also be interpreted as a form of objectification depending on the context and the individual's intentions. It is important to remember that it is not always appropriate behavior and can make a person feel uncomfortable or objectified.