no skin off my back

dont care, wont harm you a bit, wont stress over it

Possibly derived from shingles, a condition which can be brought about by severe stress among other things, after having chicken-pox. This causes painful blisters and scabs, usually on the back.

"The Coke company is the one who has to pay for the repairs, so really it's no skin off my back," said Mark Conlin, the campus plant foreman who oversees maintenance and custodial work.

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