What is "hooking up"?

What is "hooking up"?

Lillian Glass (Communication Psychologist) gives expert video advice on: Is it possible to have more than one soulmate?; How do I decide if I want to date casually or seriously?; How can I make better decisions about whom I date? and more...

Hooking up is a term that is used to describe a sexual encounter. There's not a lot of commitment there, it's just two people getting together for sex.