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1. Short for "Japanese Domestic Market." This term often means paying your left testicle for a part that you could otherwise order from kragen. The term JDM has long been used to "one-up" a friend or acquaintance at Krispy Kreme car meets and the likes. By adding a JDM item to your "ride" you are instantly "cooler" than your friend's USDM counterpart. 2. Used to describe how JDM something is, meaning that it is generally RIGHT biased/handed. This comes from Japanese Domestic Market cars mainly having right hand drive, as opposed to their USDM counterparts which are left hand drive.
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