- The definition of a hillbilly is someone who comes from a remote area with woods, hills or mountains.
An example of a hillbilly is the character Jethro from the Beverly Hillbillies TV show.
Origin: hill plush Billy, diminutive of Bill
Used by arrangement with John Wiley & Sons, Inc.
noun pl. hill·bil·lies Informal
Origin: hill + Billy, a nickname for William.