(n) someone who is very greasy.
(adj) someone who wears mini shorts and a loose shirt, or has a muffin top going on.
(n) someone who is trailer trash, shops at the good will, etc.
In Alliance, OH if you go to the Carnation Festival, you will see lots of hoopies wearing flannels, cut offs, greasy ass hair, not shaved face, and some might even have about 8 teeth or less.
Properly, a flee market in the town of Rogers, Ohio. Could be used to describe any are that hoopies are likely to shop, such as a strip mall with a Dollar General or a Family Dollar. Also frequented by trucks and dirtbikes and people sportin' the white trash 'stache
You: I need some ammo, a knock-off Versace bag, a funnel cake, a 300 pound hog and some fresh Amish produce.
Me: The only place you can get all that is the hoppie mall.