I recently have to reconsider this definition and set boundaries with my friends. Finding the ability to have a fun experience together that wasn't centered around paying for access to the experience, such as access to a place or event, or in drugs/alcohol. We were all kinda taught we have to "buy" something in order to have fun. Beer, food, vacation, concert tickets, so on. I'm not saying I don't do that any more but when I'm with my friends I'm there for a reason and I want it to be them, not the thing we paid for, it comes secondary.