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.
by blopnuts March 22, 2005
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A piece of shit. Pond Scum. Gutter Garbage. A person who is not worth your time of day. Have you ever heard someone promise something on their skin. It's the ultimate commitment to a promise. Someone who isn't worth the skin on their back is someone who constantly never follows through with anything, and is 100 percent untrustworthy.
Yet again you disappointment me and don't do what you say you are going to do. You are not worth the skin on your back. I'm done.
by The Ladybug Whispers ... April 26, 2016
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