What does "obsession" or "obsessive" mean?

What does "obsession" or "obsessive" mean?

Marc Kern (Addiction Expert, Director of Addiction Alternatives) gives expert video advice on: How is a behavioral addiction similar to a substance behavioral addiction?; What is an "addictive personality"?; What can be done about an addictive personality? and more...

It's just sort of a high faluting technical term that just sort of means sort of excessive thoughts. Thoughts that go around and around and around that are about a particular topic, over and over again, obsessing about a belief or a thing that happened. It's just more of a repetitive idea, or can even be thought of as an obsession.