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A Four-Wheel Drive vehicle (all wheel drive) e.g. Jeep, LandRover, Shogun etc. Often used to describe those very shiny ones that never go on a muddy track! Can be used for any example though. Often heard on the Isle of Wight.
He was blocking the road with a bleedin great fourby! Nobody could get past.

Nearly got knocked off my bike by a git driving a fourby.
by CaseyIW August 19, 2006
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