this is a question. asking someone if they are willing to take part in somthing an action or a what ever. Could also be in statement form. One could also say "down to the ground" meaning down to the extream.
Question: Are u-Down with a grabbing a couple (fourtys)from the store?
Answer:I am dowm
Question: Are you down with a Dub sac?
Ancer: Down to the ground.
This is a sticker found often in Hawaii. The sticker us in the shape of a U with an arrow in its center pointing down.
The waves are great u-down?