Usally this kid can get on your nerves. Jack has anger problems and is tough lookin for a fight which makes him a retard so a slang for jack would be
Retard
-John doe
Omg that guy is starting a fight must be a jack
A Dude that has a massive cock. Its usually has a girthy meaty cock 10 to 12 inches. He is also fat as shit.
He is such a Jack.
He is a Jack, I want to jerk him off.
Jack is a guy who has a one inch shrimp dick who is bad at fucking chicks and he is gay. But he is a good and nice friend other than that.
random girl: who is that?
me: that is jack, he has a shrimp dick, its rlly small.
random girl: omg ew!
Jack is a nice person and is literally the ONLY person IN THE ENTIRE FUCKING SCHOOL that will want to help you. NO MATTER HW FUCKING HARD ARE HOW EVER LONG A JACK WILL BE THERE NO MATTER WHAT.