Hillbilly Bone Share definition Flag An erection one gets while at a large family gathering from seeing close relatives. Man I was suffering big time from Hillbilly Bone when my cousins went swimming at my family reunion. Hillbilly Bone by BobDole1234 July 28, 2010 0 0 Get merch Get the Hillbilly Bone mug. Buy Now — $32.95 See more merch