obsess

To obsess over something means to think about it constantly and have trouble concentrating on anything else.

When someone says they've been obsessing over their favorite TV show or sports team, what they usually mean is that they can't stop thinking about it. They'll watch every episode multiple times, read fan forums, and often talk about it with friends and family. They might even spend hours thinking about the storylines, characters, or strategies, trying to make sense of everything. This constant focus on one thing can be a fun hobby for some people, but it can also become overwhelming if they start to neglect other important parts of their life.