1. a Snobbishly aloof person.
2. High-class; exclusive.
The origination of this is from an episode of the simpsons where Bart defends Lisa from a student at a high class private school:
Bart: "Back off Jack!"
Rich Kid: "It's Jackington."
1) A jewish person who oftentimes was born in jewrusalem and has practiced the jewish faith starting at a young age. This person often tries to turn the people near him jewish often unsuccesfully.