Top Definition
literally stands for Japanese Spec

-Parts that are domestic to the country of Japan

-Also referred to as JDM
Person 1"that bumper looks cool what is it?"
Owner " That's a J-Spec bumper"
by Alex CRX Salinas February 10, 2009
see JDM

can be used as an adjective to describe anything that is exotic to Japan and Japanese car culture
look at the angle on that exhaust - it's definitely j-spec
by sadfadf June 22, 2008
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