1. To congratulate each other is a Chinese idiom whose pinyin is tánguānxiāngqìng. It means that if a person becomes an official or is promoted, his associates will be cited as having an official position, and they will also congratulate each other. Later it was used to describe the triumph of bad people. From "Book of Han·Biography of Wang Ji".

2. Idiom usage: more formal; used as a predicate; with a derogatory meaning, referring to the proud look of a bad person.