The lane on a highway directly adjacent to an off ramp lane where Assholes try to cut in at the very last possible second to avoid a line up. This generates new traffic in the asshole lane and a subsequent chain reaction into neighboring lanes.
It is a major root of rush hour traffic on highways worldwide.
Passenger: "Dude get out of this lane quick"
Passenger: "Because it's the asshole lane!"
Driver: "Thanks you are so wise"