Bad Motorist, Wanker! ... with little or no regard for other road users. This person can only drive in the fast lane magnetised to the rear bumper of another car. They have to overtake everything even if the maneouvre may very easily result in a multi vehicle pile up!!
"Oh look, 100yds to the services, I'll slow down from 120mph while cutting accross three lanes of heavy traffic so i can have a quick slash" or maybe a wank!!!