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Jacked Stiff means you're so dead, you might as well be in a coffin. If someone jacks you stiff, you're not just hurt, you're obliterated.
My cousin got jacked stiff by a gang. Now he's in the hospital and his wallet's missing.
That guy got jacked stiff by a guy with a knife. Now he's just a pile of meat.
My dog got jacked stiff by a raccoon. Now he's just a pile of fur and disappointment.