Yipster is derived form the word combination of Yuppie & Hipster
A yipster is a person whose physical appearance resembles a hipster, but yet, rejects the uber philosophy of hipsterdom. Since they don't side with one side or the other, they tend to think that they are above everyone else. They are people who would hang out in an up and coming area, but yet never live in that area.
look at that guy with the skinny jeans.. he's talking to a room full of popped collar, khaki wearing guys discussing their plans for the DMB concert. He must be a Yipster.