Ja'understand
A question that sounds like you're asking if they get it, but you're really just trying to sound like a Jamaican who doesn't know how to say 'do you understand' properly. It’s like asking if they’re stupid but with more flavor.
Ja'understand? You look like you just woke up from a coma.
Ja'understand? I'm speaking English, not pig Latin.
Ja'understand? You're acting like I'm speaking in tongues.