jackpot
n.—Gloss: in firefighting slang, a flammable place. «The fire kept trying to creep past them. A few sparks jumped into a nest of wood chips in an old log—”a jackpot,” firefighter lingo for a flammable spot.» —“Few understand Calif. fire fight’s front lines” by Chris Woodyard, William M. Welch, Matt Krantz USA Today Oct. 25, 2007. (source: Double-Tongued Dictionary)
Further reading
David from Plymouth, Wisconsin, wonders about the expression a cord of wood. The phrase goes back to the 17th century and has to do with using a cord to measure a specific quantity of stacked wood. This is part of a complete episode.
Related
Amid court-ordered busing in the 1970s, a middle-school teacher tried to distract her nervous students on the first day of class with this strange assignment: find a monarch caterpillar. The result? A memorable lesson in the miracle of metamorphosis...