Ja'understand
A question that's really just 'do you understand?' but you're making it sound like you're from Jamaica and you're trying to impress people. It's like asking if they're stupid, but with more drama.
Ja'understand? I'm not speaking in a language you know.
Ja'understand? I just said that, like, 10 times.
Ja'understand? Are you a robot or just a brainless human?