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2.
When a girls thong is riding above the pant line, and therefore visible.
Yo man, that chick just bent over, goddam! shez a high rider.
by Jizzy wizzy October 27, 2007
 
1.
High riders are breasts that are positioned significantly higher up than average on the female chest without requiring any support to do so. The exact opposite of two tennis balls in a pair of panty-hose.
Did you see the high riders on that waitress?

Weird...one stripper has hangers but the other has high riders.

by Lou_III December 22, 2006
 
3.
Passe term for the type that had ski-racks on their cars in the summertime, with a sticker that said "Think Snow."
That blond high-rider was a complete idiot.
by cornholio October 14, 2003