When numerous persons with the name of Jack gather and compete over who can pleasure themselves the best, most efficiently, or fastest. Any other competition parameter works under this term, but it must pertain to multiple Jacks masturbating.
"Hey homie, did you attend the Jack jack off off last night?"

"Yeah man! Jack was on fire, but other Jack finished in record time. I couldn't believe my eyes!"
Get the Jack jack off off mug.
When a person, male or female, tends to stroke your penis until you get off. Otherwise known as a handjob. It is another way to have someone else masturbate you when you really do not want to have sex.
Last night Sarah asked me, "Can I jack you off? So, I said "sure".
"Wow, I really would love to jack you off, baby!"
by Thotcrates September 25, 2016
Get the jack you off mug.
A competition among males to see who can ejaculate the largest amount of semen.
Dude 1: Dude, I challenge you to a jack-off-off. I've been saving up.
Dude 2: No good dude, I've already busted a load today.
by necronanofelcher November 17, 2009
Get the jack-off-off mug.
A term people use to describe the act of a woman jerking off a guy and then proceeds to do one of two things:

- put the semen in her mouth (SHE WILL ONLY DO THIS FOR ATTENTION)
- stroke her vagina across the semen
(SHE WILL DO THIS FOR PREGNANCY)
Michael: Okay, babe. Let's do the, you know...
Beth: Oh, do I get to jack you off?
Michael: Yep! But mouth, not vagina I plan to leave you tomorrow not in 18 years.
by CrazyChixo September 25, 2016
Get the jack you off mug.
Texas Hold 'Em hand, in which the player holds a Jack and a King of differing, or, "off" suits.
"I called his bluff since my jack king off gave me a full house"
by feralnogitsune July 15, 2008
Get the jack king off mug.