`To drink tea` as a slang in Chinese means to be asked to talk with authority, especially the police, etc., which is generally not regarded as a good thing. Si

`To drink tea` as a slang in Chinese means to be asked to talk with authority, especially the police, etc., which is generally not regarded as a good thing. Similarly, `to check the water meter` and `to receive a post package` mean the police to come to your door, as the police are thought to be disguised as staff from tap water company/package delivery company, in both cases, you are about to open the door.