yay slang for "you know wad I'm sayin'"
also yadadabooboo, yadadamean, yadadimean...
ghost ride the whip, yadadasayin?
When someone is driving in their car with a bunch of friends, and everyone opens and closes their doors, again and again, to make it seem like your car is going because of the doors being flapped. The driver usually participates aswell. Similar to ghost riding, except you don't get out. Originated in Southern Ontario, Canada.
Look at those pimps flap the wings on that whip.