pre-jacking 

Jacking off prior to the actual desired ejaculation time - the goal being to cut down the time required when actually finishing the job.

He didn't think she was actually going to do the trick, so he started pre-jacking while she was in the bathroom.

pre-jacking by bestnarcolepsyever March 15, 2009

jumping jacking

when the guy exsplodes with so much cum it send the gir flying in the air ussaually to her death

sally dies whille jumping jacking

jumping jacking by the jacker12321 April 24, 2016

Underwater Jacking 

I believe a better term for wanking in the tub would be "Bathturbation"

Last night Dan had a bath and performed Underwater Jacking aka Bathturbation

Underwater Jacking by lizard_lightning March 21, 2015

Jacking with me 

When someone gets up in your grill trying to mess with you.

Stop jacking with me, dude!

Jacking with me by jackwithme11 April 13, 2010

bat jacking 

A masturbation technique where a male masturbator rolls back onto his shoulders, with his body in the air over his face for the purposes of either giving himself a cum facial or eating his own load. Since the masturbator is essentially upside down, he takes on the appearance of a sleeping bat.

"I'm not flexible enough to suck myself off, so in order to cum in my own mouth, I have to resort to bat jacking"

bat jacking by Char H January 8, 2006

jacking off

When stimulating a personal part of your body.

Most people like jacking off

jacking off by Anonymous April 30, 2003

jacking jill up the hill

mutual masturbation between a male and a female

"yeah me and tina was jacking jill up the hill last night, and she made it all the way to the top, and I came right right after her"

jacking jill up the hill by Naruchico January 2, 2009