The double j/k is a sometimes annoying practice of saying jk/j/k multiple times in a row. It is thus an example of epiphora, for you linguistic nerds out there. Ordinarily used when messing with someone. Occasionally double j/k's are used to make someone THINK you were joking.
Prima: I banged your sister.
Secunda: WHAT!?
Prima: also I crashed your car.

Secunda: ARE YOU FUCKING--
Prima: double j/k! *cough*

Prima: I hate you.
Secunda: D:
Prima: j/k!
Secunda: ..you ass.
Prima: YOU'RE an ass, God, you're such a fuckhead sometimes! I can't believe you!
Secunda: wha--but--I--
Prima: J/K! Hahahaha!
Secunda: -_-;
by ReySquared May 17, 2009
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The disease in which a white person tries VERY hard to act like a black racial stereotype. Symptoms can include, avoiding making white friends, saying "Nigga" unironically, trying to speak in a deeper voice, and calling his fellow white people "crackers". This disease affects many children around America, and sadly there is no cure for this deadly disease. Prior to this Urban Dictionary article you are reading now, I could not find a name for this disease. So I named it the "Double J Gaming syndrome" For obvious reasons I do not need to explain.
"Yo man that kid has Double J Gaming Syndrome he's trying so hard to be black!"
by Thebomdotcom2011 August 6, 2017
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A threesome sex-position for female-female-male

it's where a male lays down, and has female #1 ride their dick, and female #2 rides their face as they get ate out.

Then midway the two females switch positions.
Buddy #1: "So what did you do today?"

Buddy #2: "Oh I had some girls over."

Buddy #1: "okayyy I see youuu"

Buddy #2: "Yessirrr, gave them bitches the J-Double."
by JObatala May 28, 2022
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