Definition
Someone who has achieved mastery-level knowledge of the 2004 racing simulation video game Gran Turismo 4, possessing encyclopedic expertise about its cars, tracks, and mechanics. This person can tell you the exact horsepower specifications of every vehicle in the game and probably spent their entire adolescence perfecting the Nürburgring lap. A very specific flex from a very specific era of gaming.
Example Usage
Don't even try to debate PS2 racing games with Marcus—he's a total gran turismo 4 gearhead and will destroy you with statistics.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=gran%20turismo%204%20gearhead&defid=1939967)
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