Top Definition
Late-model Buick Roadmaster that has had its engine modified to increase horsepower -- effectively making it into the Gran Sport model that was never factory-built. The most eligible years are 1994-96 when the 350 cubic inch (5.7L) LT-1 Corvette engine was standard.

Typical modifications:

Suncoast RAISS Cold Air Intake
Suncoast Functional Ram Air Hood
Edelbrock performer tunnel ram intake manifold
52mm Edelbrock Throttle Body
ClearImage Tri-Y headers
Flowmaster 40 Series mufflers
Jet Performance Power Control Module
Edelbrock Performer 54cc Cylinder Heads
* ROAR!! *

"Did we just get blown away by a station wagon?"

"Yea, that was a Roadmonster."
by walford December 08, 2009
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