Either during sex at orgasm or while your 'one night stand' is asleep.
the idea is you cum and shit all over your partner at the same time giving you and your partner your weird sexual jollys. if your partner is asleep then you do the same process without waking her up and leave her alone in her house/flat, so she wakes up with shit and cum all over her body, make sure you give her a fake name so she cant track you down.
Ex1 - dude i was banging this chick lastnight and she asked me to double jack all over her face!

Ex2 - hey i had this one night stand lastnight and when she was asleep i doublejacked all over her body and i went back home!
by Reiss "The Sex" Jones May 5, 2008
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When you assist your partner in jacking off.

Jacking off your Boyfriend the same time he masturbate.
Did you enjoy our Double Jack this morning?
by Past & Present June 27, 2015
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When a gang member or affiliated person represents (jacks) two different gang sets. An example of this would be OYs and OGz in the Bronx, New York, who often throw up OY OGz even though they are two completely different gangs.
He rep' OYs and OGz he double jacking.
by ImSpoody July 10, 2022
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A shooter that is made of 1/2 yukon jack, 1/2 jack daniels
Did you see Derek last night? 4 double jacks and he was done!
by DAWS-C November 25, 2007
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When you accidentally plug two banana plugs into the same hole. Other wise known as the mating ritual of the consenting adult banana jack.
Kirt was double jacking it this morning and messed up his equipment!
by Clive&Cleetus May 10, 2007
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When you get a handjob from two hookers while doing cocaine
Bill's wife was about to go down on him, but he said, "nah, I'd rather have a double jack n coke instead."
by Open Thy Garage Porn October 4, 2014
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Exact same Idea As The Double Jack But Instead Of Shiting On The Partner You Do The Same But When You Have Diarrhea!
Some Would Say This Is Sick But Oh Well!
See Yah!
Yeah I Had Diarrhea So I Double Jack Extremed My Wife!
by Reiss 'The Sex' Jones May 28, 2008
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