A jack interrupts for attention.
"LOL OMG WHAT'S BILLY DOING?"
Most jacks are short for the term JACKass.
Blonde Jacks think they are all that and a bag of chips, but they are not. They think they know everything when all they really know is how to eat shit.
Jacks loves everybodys mommas so keep them locked up away especially your fathers, cause god knows jack would give them the death.
Jacks may be muscley and think they are great but beware as jacks are hot tempered and like to box anything in sight... even a blue bottle fly
Jack comes from the meaning of a simp
Jacks also likes big booooty boys for a good time, and usually love spending their time playing gay rugby and touching up other lads.
he gave it to him up the jack last night