It means that it was nice meeting you. Something like a good follow up conversation with a person.

How do you say good to catch up?

Senior Member. If you agree that it was nice to catch up, then you're at liberty to say so. You could say: 'Yes, I enjoyed it too. '.

How do you thank someone for catch up?

Thank you so much for meeting with me today. I really enjoyed our conversation and learning more about what you do at Company Name. I truly appreciated all your advice and tips on how to break into industry.