jack on 

To instruct a fellow jackoff(n) to continue jacking off(v), despite himmerself's better logic.

To Bush,
Jack on, jackoff.

jack on by Pillup March 23, 2006

Jack On 

To reverse ejaculate, using your penis to suck in the semen like a vacuum cleaner.

I heard my parents coming to my room so I quickly had to Jack On

Jack On by Will_I_Am23 November 16, 2020

jack on 

The least sexual act an individual can commit.

Woman: What are you doing today?
Man: I'm going to go to a funeral and jack on.

jack on by adam12121212121212 March 20, 2010

Jack on 

The art of jacking on is a much unknown art lost long ago in the Roman empire
Archieologists have discovered several requirements for jacking on by studying scripts from roman murals
the requirements are as follows
1.Strong left leg
2.Slightly short middle fingers
3.a high pain thershold
4.6 foot 2.5
we would ask anyone with these qualitys to ontact their local museum and ask about the phenomenon and then ask were they can go for testing into these qualitys in relationship to curent reasearch

"Oh man last night i had the biggest jack on last night and I nearly broke my left leg as it wasnt strong enough"
"That totally sucks!"

Jack on by Jack onner October 1, 2007

jack on 

A method of masturbation that is similar to "jacking off" but the masturbator stops beating his meat when he reaches optimum hardness (about 15-20 ohms or 3-5 minutes, depending on stamina level) instead of ejaculating all over himself and/or the area of seminal wreckage. This is usually performed immediately prior to sexual activity. May encourage an amateur robber to steal (jack) valuable things from other people.

Hoe: "Man is that all you got? You really need to go somewhere so you can jack on and hit dis shit right!" Jack: "No prob, just give me a handjob before i have to bust out da Playboy magazine again..." Hoe: "You know my hands can't fit dat little ass worm you call a dick, go to the bathroom!" Jack: "Alright, I'll be back." (Goes to the bathroom and jacks on, and comes out wearing a superman suit with dick hanging out) Jack: "Have No Fear, SUPERMAN is here!" (Dives straight into the pussy) Hoe: "That was so much deeper... Where's my money?" (Jack gives her $350) Hoe: "Wow, i thought you didn't had it in you... You're my hero!" Jack: "As long as my Jack is on, anything is possible!" Hoe: "Whatever." ((Meanwhile, in the streets)) Nigga: "Yo homeboy, u down for hittin deez licks wit me n my goons?" Homeboy: "Hell yea, as soon as i het a chance to jack on first."

jack on by ogdajuiceman November 29, 2010

Jack On 

to get a jack on,
to walk so closly behind someone as to invaid their personal space.
treading on another mans heel

*one guy treads on anothers heel*

"oi!, whats this?? getting a JACK ON are we?"

Jack On by stonerchris January 24, 2008

jack on the rocks 

A glass of jack Daniels whiskey with ice. Not as manly as jack nice and tidy, but you won't get a second look drinking this.

"What'll It be today ?"
"Jack on the rocks, go easy on the ice"

jack on the rocks by FerretFTW May 21, 2017