What “Weh yuh deh pon?” means
Weh yuh deh pon? asks what someone is up to or what they have planned. "Deh pon" means to be on or busy with something, so the question is literally "what are you on?".
Examples
Weh yuh deh pon later?
What are you up to later?
Mi deh pon a work ting
I'm working on something.
How to use it
A casual question between friends, often before suggesting a link-up. Without pon, "Weh yuh deh?" asks where someone is instead.