Nm, I looked it up. Love definitions 2 and 3 in the urban dictionary:
1. Acronym for the Outer Banks (beachish area in North Carolina). Commonly seen on vehicles-- little round stickers-- on the east coast.
2. Somehow it's short for "outer banks." They're printed on stickers that resemble the black and white country stickers cars have on them on Europe. People use them to tell everyone "Look at me!!! I went to the beach! I paid too much for a sticker/license plate!@!@"
Beach bum wanna be's.
3. Commonly seen on small, oval bumper stickers and believed to mean "OuterBanks" but really denotes that the driver/owner of the vehicle is obnoxious. No common usage other than the annoying little white stickers.