"Wángbādàn" is a practical slang that you have to remember. "Wángbādàn" means "bastard". When someone do something wrong to you, you can say this word to show your anger. However, you need to remember "Wángbādàn" is kind of offensive. Let's see an example.
Example:
Your friend: Damn! They forgot to put tapioca in my milk tea!
You: Those "Wángbādàn"!
