I worked my butt to the bone

I’ve heard “bad to the bone”, but “butt to the bone”?  This hilarious, alliterative malaphor was uttered on a radio commercial promo for an upcoming Judge Judy show.   It is a congruent conflation of “worked my butt off” and “worked my fingers to the bone”, both meaning to work extremely hard.  Perhaps this should now be an expression used by workout trainers.  A big thank you to Steve Grieme who heard this one and passed it on!