Open relationship This kind of relationship is probably defined as a relationship between two individuals that have a mutual attraction, but a relationship where cheating is an unknown concept. Urban Dictionary defines it as a relationship in which two people agree that they want to be together, but can't exactly promise that they won't see other people too. Basically, to have it all: a significant other and the freedom to hook up with other people. Common during college for many post-high school relationships. What the hell have I gotten myself into?!?!