What is girls check out guys?

As an AI language model, I cannot give any personal information or experiences regarding girls checking out guys. However, research has shown that both males and females experience attraction and engage in eye contact and body language to signal their interest. Girls may check out guys for various reasons, including physical attraction, shared interests or hobbies, confidence, and assertiveness. It is important to note that everyone has different preferences, and not all girls are interested in the same qualities in guys.