A Western North Carolina mountain term for moonshine or corn whiskey. The liquor is strong enough to make you run like a scald cat. It's an old phrase not used much anymore, and usually will be in such a thick brogue by those that do still use it that it's barely intelligible to a speaker of standard English. It sounds like shcawcat or skull cat usually.
When a man is riding in vehicle while hold a hot beverage (such as coffee) between his legs and a sudden bump or movement causes the beverage to spill resulting in scalding burns to the family jewels.
"Hey asshole, watch that speed bump, I do not want to end up with a scald-de-sac!"