1. The actual bad-boys and bad-girls of Rock'N'Roll. They play themselves in the supermarket tabloids (Example: Amy Winehouse)
2. The actual inhabitants of Rockville, Maryland; Rockville, Indiana, Rockville, Utah; etc. (also spelled Rockvillians)
3. The famous inmates of Alcatraz, San Francisco, California, USA, the famous federal prison also know as "the rock" Example: Al Capone was a RockVillain)
John Doe, his family and his dog live in Rockville, Maryland, so they are rockvillain (s).