This is an important bad word that you must know. "Báichī" means idiot in Chinese. When someone do something stupid, you can say this word to him/her. More importantly, when someone say "Báichī" to you, you need to understand the word and react quickly. I will show you in the following example.
Example:
Someone: You know, you are a "Báichī"!
You: You are a "Tāmāde""Báichī"!
