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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A fourbie fuckwit is the shit stain on the ass crack of society. Usually someone with a Ranger thats been lifted with the biggest tyres they could jam under it, fitted with 700kgs worth of accessories including the shittest ebay flares they could find. Driving style is always angry, everyone is in their way and road rules dont apply. Their dreams and aspirations are hoping one day they will get distracted rolling up a dart and smash into a small car killing the entire family because they have turned their car into a battering ram to do sick sand digs on the beach.
Look there's a jacked up 4x4 with bricks for flares hard up my ass weaving around.. yep its a "Fourbie Fuckwit"
by TG45 October 13, 2022
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You should'a seen Scott flip his fourbie at the hill climb today!
by TheSharpie314 January 23, 2014
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