A title or phrase used to describe a persons appearance as being very unkempt and cheap (not "tight on money" cheap, but "has no money" cheap.)
Skanky people can be walmart shoppers, however; not all walmart shoppers can be skanks, often times lacking the sluttiness that is required.
Sean: Hey dude look at that chick. I betcha I could tap that.
Jon: Yeah, you probably could, but why would you want to? She looks pretty ragged and poor.
Sean: I dont know, im horny and she looks easy.
Jon: dude, shes a fuckin Walmart Shopper... look at her!