What is if a guy says you look familiar?

If a guy says you look familiar, it could mean that he recognizes you from somewhere but can't quite place it. This can happen if you have crossed paths before, such as at a social event, school or work, or if you have mutual friends or acquaintances.

However, it's also possible that he might be trying to start a conversation with you. Some people use this as a pickup line to strike up a conversation and get to know someone better.

In any case, it's a good idea to respond politely and ask if you know each other from somewhere specific. This can help clarify the situation and keep the conversation going if you're interested.