Jam Jackin Jervis is a well known figure in the GTA in Canada. JJJ is well known for stealing almost anything, from car tires to laptops. Jam Jackin Jervis loves to also steal things from partys. Eventually the phrase "Jam Jacked" has transpired into a phrase said by those who have had somthing stolen from them.
*Child enters his hallway at school and see's his locker has been cut*
Student 1 "Looks like Jam Jackin Jervis has been here!"
Student 2 "Ahhhhh, I've been Jam Jacked!"