Pronounced sī dòu, this literally means "secret burrow," which often refers to a comfortable and safe place to gather with friends in noisy bustling cities.
A sī dòu can be a restaurant with ambience that makes you feel like you're sitting in the dining room of an old friend, a café where you can share your emotions with like-minded folks, or any other place that has a comfortable and relaxing setting.
Let's put it into context:
Allen: Hey Phil, what's your plan for the weekend?
Phil: Nothing special. Maybe I'll just be a homebody and have a good rest.
Allen: Oh, look at your love handles. Let's find a sī dòu and call Steven and Jessica to come. It's been a long time since we've seen them.
Phil: Sounds fine to me. How about Déjà Vu, the bookstore with café décor?
Allen: That sounds like a good choice.