I am currently a flat-lander and I admit it. My definition of "hilly" is anything vertical other than the pipelines that cross the Mississippi River levee. In these parts, riding over a freeway overpass constitutes a hill. There's a section of the Miss River levee that has several pipeline crossings that roller coaster, then you ride down off the levee under some more pipes, and back up - it's all rather fun - especially if no one else is on the path and you can hammer it.

On the MS-150, we ride in the "Florida Parishes" and into southern Mississippi, which has right and proper hills, which I suppose most of you would call "rolling."