What's "all about" mean?

Native speaker’s answer
Rebecca
To be "all about [something]" means to be passionate about something. It can also be used to mean the main focus or topic of something. Ex: I'm all about basil pasta. I'd eat it every night if I could. Ex: This movie is all about a girl who goes to an art college and the people she meets. Ex: I'm all about horror movies! I've watched all of them.