Nah, I'm not Chinese.

You yell this when someone is talking and you just want to shut them up like they're a loud, smelly, annoying kid at a family reunion.

You say it when someone is trying to explain something, and you're too lazy to listen, so you just interrupt them like they're a broken radio.

You say this when you're too dumb to understand what someone is saying, so you just yell it like you're trying to win a screaming contest.

You say it when someone is talking and you just want to prove you're smarter than them, even if you're not.