One (male) who in conversation with a fellow, workmate etc is inclined to grab the other guy's crotch suddenly and without warning. The object is ostensibly to put the victim ill at ease and in a state of embarrassment. However, one wonders if it's simply an excuse to grab other mens' genitals.
Tony: I hate talking to Mike. I'm in the middle of a sentence and he just grabs my dick every time
Stan: yup, he's a cock jacker to be sure
Stan: yup, he's a cock jacker to be sure
by Iggle Piggle's alcoholic broth June 3, 2020

Eating Black Jack sweets before giving your bf a blow job then as he cums, choke on his jizz and puke the black jack and jizz mixture back up on his dick!
'Oh hey Zac! I did a black jacker on my bf'
'What's that then Emma?'
'Well I ate black jacks before giving my bf a blow job and I puked on him as he cum in my mouth..'
'What's that then Emma?'
'Well I ate black jacks before giving my bf a blow job and I puked on him as he cum in my mouth..'
by JammyEm August 3, 2021

First individual: hum hum hu-
Second individual: hum hum hum
First individual: You are such a hum jacker!
Second individual: hum hum hum
First individual: You are such a hum jacker!
by Trent Naidu June 13, 2017

by Miles Clement April 21, 2008

Jacker is a teenager who gets buzzed after drinking too many bang energy drinks. he listens to kidzbop while snorting cocaine. known as “Tubby” by his friends. he tries hard to get his vertical up. it is nearly as high as he gets after his cheeto dust-meth sessions. he feels comforted by beef sticks. tries to keep his relationship with his purple-haired girlfriend secret. he also after they annoy him to his sister’s dismay. becomes self conscious when called a gringo.
by ghandi einstein April 18, 2020

by A Person #2936363 January 30, 2018

Tom: dad my arm really hurts.
Tom's dad: hmm must be jackers cramp
Tom: www shut up dad! You're embarrassing me I don't do that!
Jacking off masturbation
Tom's dad: hmm must be jackers cramp
Tom: www shut up dad! You're embarrassing me I don't do that!
Jacking off masturbation
by Pirotek March 19, 2017
