1. Refers to New Jersey, a state of massive struggletude and sorrows for all who permanently reside there.
2. An unfavorable action or attitude that is annoying or sickening, thus reminding one of the feeling they get while present in New Jersey.
3. Someone who is confident or arrogant for no apparent reason, namely with nothing to back it up.
"Partying in the Jerz again this weekend, huh? That sucks for you..."
"That club was so Jerz, do you think they could have packed any more guidos in there?!"
"Why are you being such a Jerz? Nobody likes you anyway."