The term "hookup" can refer to a variety of different behaviors and relationships, but generally it refers to some form of casual or temporary sexual encounter between two people. It may involve physical intimacy, such as kissing, touching, or other forms of sexual activity, without any expectation of a long-term relationship or commitment. The term can also be used more broadly to refer to any kind of non-romantic or casual connection between individuals, whether it's a one-time hangout or an ongoing friendship. Ultimately, the meaning of "hookup" can vary depending on the context and the people involved.