I was very pissed off when my definition for Kiss My Shiny Metal Ass was rejected for the third time, despite the fact that there was nothing wrong with it. I read why it might not of been posted, and nothing was wrong with it!
Originally from Talladega Nights: The Ballad of Ricky Bobby, anytime a real driver loses his or her touch, putting themselves in a position where they endanger their own safety or that of the other drivers on the road, they are said to be "driving like a pissed off teenager".
Lucius: "You know you're driving like a pissed off teenager, okay?"
Ricky Bobby: "This sticker is dangerous and inconvenient, but I do love Fig Newtons."
Extraordinarily angry. Can be triggered by traumatic events that disrupt your most basic sense of self worth such as getting fired, getting raped, losing a loved one. If you are emotionally unbalanced like me this can be caused by events as trivial as being cut off in traffic, or getting a B on your final exam.