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1.
V. doing something that you should not... or using an implement for a purpose other then its intended purpose. Jackpotting always result in someone getting hurt and or something getting broken
"billy get off the roof of that car and stop jackpotting!"
by Alliebabowa November 11, 2007
 
2.
Sexual practice in which elderly folk perform surprise anal sex on others whilst they lean over a slot machine at a casino. Often this is facilitated by the receiver leaning on a walker.
"Herbert, let's head down to the Aisle of Capri Casino this Saturday for the buffet and some Jackpotting."
by LeechBucket December 16, 2011