Seem-ride(r): a name used to refer to both boys and girls who tend to wear form-fitting clothing. The term describes how one's clothing seams do not fail to touch every inch of their body, thus allowing the joke that one is riding their seam.
NATE: "I don't think I should go into that bar."
ANDY: "And why not? Intimidated by all the sexy girls in there?"
NATE: "No. What's intimidating me are all the seamriders. They're probably all in there wearing cowboy hats and drinking the whole place dry."