1) A little bug that rolls in on itself when threatened. Kind of cute. It is a conscientious objector - it only defends itself.
2) Also, people have been known to refer to other people by this name - it's crazy, I know.
1) Aw, look. When I blew on that lil' potato bug, it rolled in on itself.
2) (person referring to another person) You're a potato bug.