What “Yes I” means
Yes I is a Rasta-influenced greeting and affirmation. It can mean "hello", "yes" or "I agree". In Rasta speech "I" stands in for other pronouns as a mark of dignity and unity, and Yes I carries that feeling.
Examples
Yes I! Wah gwaan, bredrin?
Hey! What's up, my friend?
How to use it
Rooted in Rasta language but heard well beyond it, especially among young men and in reggae and dancehall. It's upbeat and familiar rather than formal.