More commonly known as "Applejack", it is re-distilled cider (or hard cider, in the U.S.).

The process raises it's alchoholic content.

The name Jersey Lightning comes from colonial times, in which road workers in New Jersey would be paid in applejack.
"These workers need to get going faster"
"Just give 'em some jersey lightning!"
by IcarusBeDamned January 18, 2007
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applejack, a brandy made by distilling hard apple cider (from the fact that the distilleries that produce it are in New Jersey)
a shot of Jersey lightning, let alone plain old brandy, is enough to make me sick.
by The Return of Light Joker October 26, 2010
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The mysterious sudden fire in unoccupied buildings that is heavily insured ...
That old empty warehouse by the river burned down last night with no one around. Sounds suspicious like arson. it was just a little Jersey LIghtning
by Sunnync May 20, 2020
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