The phrase "to hang around" means to spend time in a particular place or with certain people, without any specific purpose or agenda. It is often used to describe someone who spends their free time at a particular location, such as a friend's house or a favorite cafe, without any clear reason for being there. The phrase can also be used more broadly to refer to someone who frequently visits certain places or socializes with specific people, even if they don't have an obvious purpose in doing so.