Refers to the barrier islands along North Carolina's southern coast. Including, but not limited to, Atlantic Beach, Salter Path, Indian Beach, and Emerald Isle. In some cases the mainland towns are considered part of the SOBX, including Morehead City, Beaufort, and Cedar Point.
In rare cases, extreme southern NC beaches will be listed as part of the SOBX, including Topsail Beach, and areas around Surf City.
Me: Hey let's take a day trip to the SOBX.
Him: Sure, but what's that?
Me: the Southern Outer Banks. Let's go to Emerald Isle.