Definitions by Telluriders

Devil's Butt Bone 

The extra bony mass floating freely within the fat of the ass cheeks of the Devil himself, detached from all other bone structure.

Also a euphamism to describe someone who's being naughty.

"That sonovabitch there's got a bad case o' Devil's Butt Bone"

Devil's Butt Bone by Telluriders June 5, 2017