The word "jerk," according to the always-reliable Urban Dictionary, is "an insensitive, selfish, ignorant, cocky person who is inconsiderate and does stupid things."
Such a slang term is based on one's perspective, especially when it comes to motorsports history.
A "jerk" could be someone like Kurt Busch (or, better yet, his younger brother Kyle) a driver who is willing to speak his mind and throw temper tantrums when things doesn't go his/her way.
A "jerk" could be a horribly inept track owner who decides to run his own open-wheel series with the world's most prestigious oval race, while the teams and drivers that made it so decide to go their own way.
Without further ado, here are the 20 biggest jerks in motorsports history. Keep in mind that "jerk" is a relative term.