it's just a generation reference. slightly less impersonal than 5th gen, 6th gen, etc. Not JDM just more technical. technical is knowing what you're talkign about. rice is making your car look fast without it being fast.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
Thank the "JDM" fanboys for starting that whole ball of wax. I still prefer to say 5th generation and 6th generation for a reference.
We can also thank the 'JDM fanboys' for 1988-1991 Civics being called EFs. This is REALLY, REALLY, REALLY stupid because you will NEVER find a USDM Civic that is an EF. ALL USDM Civics are actually EDs.