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."
Jamingson's Law is a term used when people resort to petty and unjustified insults in an argument to try and look intimidating.
full definition- If you feel the need to call resort to insults in a formal argument you are an idiot, a fool, and should leave immediately to avoid looking like a bigger fool
Guy #1 No Ford is a way better brand than Honda
Guy#2 No Honda Is better by a longshot Guy#1 Whatever, bitch ass loser.
Guy#2 Heh, ever heard of Jamingson's Law.