Cracking Jack

The act of jerking off (typically a man), especially to the point of orgasm.

Originates from the term "jacking off" as well as the similarity of the "cracking" sound from performing it and the opening of usually alcoholic beverage bottles.
It is also a popular perversion of "cracker jack", the brand of caramel corn.

Roommate: "You two were so loud last night! I heard you cracking jack so loud I couldn't get to sleep!"

"Yo, she was cracking jack so hard i almost passed out!"

jacking my squash

When somebody is pissing you off

Random guy: your kinda gay. Me: your really jacking my squash right about now

bunk jack

your not getting it back it’s took/stolen

Anna asked for her money back but imma bunk jack

Jack demarest

Has a vagina is a faggot

everybody hates jack demarest

jack cohen

Jewish kid

Damn Jack cohen you smart asl

jack-stalker

A person who will stalk another person via social media and drive distances up to 1,000 miles to stalk the person at their workplace and home.

Do not talk to Susie because became a Jack-Stalker after billy broke up with her.

Jack Lansdown

A sexy beast that everyone loves. Whenever you walk past him you just always become so happy. He has a big penis and an even bigger gyat. He is a very good friend, and suprisingly good at cricket. He also is really good at school for a white person. He is also is a ABSOLUTE SMASH.

"Oh my good Jack Lansdown you have a mega gyat"
"Jack Lansdown you look so fine today"