The use of the word is done so in which to trick someone during the game of Bullshit / Cheat / I Doubt It, not just restricted to jacks but to your personal favourite card. This is used to make someone think you are bullshitting, or to people that know you more well, make them think you are in fact not bullshitting.
You: Yeah I place down a stealth jack...I mean a 7
Silly Billy: Oh mate that defo bullshit you so put down a jack
You: nah m9 #dealwithit
or
You: Stealth jac...I mean a 6
People: You do that all the time now we know it is a 6
You: *gets a free pass for lying*
Jacking off in a public place/room with some people without anyone noticing and busting a nut.
A: I managed to pull off a stealth jack in a room with 3 people.
B: That's fucking disgusting but also pretty impressive.
The kid in all the dumb classes, yeah that’s Jack Beecher.
Areano Grande but spanish, male, and a gamer
I'm more of a Jack Hotspot type of guy.
A weird little racist freak who everyone hates
“Did you hear about the guy who got caught jacking off to Mein Kampf? He’s a real Jack Posobiec”
An intelligence officer so bad at their job, they took 7 years to make LTjg and can only be trusted with watching other people pee in a cup.
Dude that ensign is awful, a real Jack Posobiec.
A terminal medical condition which causes the penis to enter and fuse with the rectum. This blocks the colon, forcing the patient to regurgitate a noxious mixture of feces and urine. Eventually the patient asphyxiates on their own excrement.
Person1: OMG is that guy choking?!
Person2: Don't worry they just have Jack Posobiec, it will be over soon.