A person who remains in the left (passing lane) on the freeway thus forcing all other traffic to pass them on the right.

n. \ˈpas-ˌ(h)ōl\ a motor-vehicle operator with a hair and/or other irritable object in their rectum, who will take any conceivable risk to themselves, other motorists, cyclists, pedestrians, or free-roaming animals in order to gain a car's length before stopping at the next red light.

n. \ˈpas-ˌ(h)ōl\ a motor-vehicle operator who speeds up when they realize they are about to be passed.

n. \ˈpas-ˌ(h)ōl\ a motor-vehicle operator who drifts aimlessly into the passing lane, but who lacks the ability, will, or common sense to apply pressure to the gas pedal, thereby causing motorists behind them to click out of cruise control, pwning their driving buzz.

Two cars driving side-by-side at the same speed when there are only two lanes going in one direction on the highway, preventing anyone else from passing.

A passhole is someone who passes you (while you're going a reasonable speed) just so they can drive faster.

A driver that rides your ass late at night on a dark twisty country road flashing their lights and honking. Once you reach a two lane road, the passhole will not pass you right away, choosing instead to hold their horn and flash their lights behind you as you drive 5 miles over the speed limit concentrating on not dying. The passhole will then often turn on their brights and pass you slowly, making sure that the glory of their redneck hi-beams used to find deer or escaped convicts blinds you in both your rear and sideview mirrors.

Someone who passes you and then goes really slow.

A contraction of passenger and asshole.

An innate condition overcoming anyone sitting in the passenger seat. Condition consists of passenger making unhelpful suggestions to the driver using a condescending and self righteous tone. Most often noticed in couples.