Merge Burgler
One who uses the merge lane as an actual, viable, legal lane of traffic, for the purpose of a) getting into a static lane of traffic far in advance of the other vehicles who have merged more promptly, or b) passing moving traffic at greater speeds than even the current 'fast lane' would allow.
Al was in the habit of only half-occupying a lane when he merged into it, leaving half his 1990 Dodge Dart hanging into the merge lane to discourage the Merge Burgler s.