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devil's bones 

The worst damn kind of bones there are
devil's bones by Mike Truitt August 5, 2003

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"