Blue bloods : Is a verified medical condition that results from inbreeding. It was true of very few Europeon royals but predominant for the highest class (Brahmans) in India going back several hundred years ago. You will note that not just ancient Indian artists painted Brahmans blue.
The condition was associated with hemophelia bruises but that is not always the case.
There were some cases known among the very poor in Appalachia but it is not politically correct to stereotypically inflict this fact upon West Virginians today.

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"Shit fire and save matches"

I suppose if one did shit fire they could conceivably save on matches or any other such lighter device.