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I think the new member is referring to the generic form of Jimmy as in GMC. I had the GMC S-15 and no one seemed to mind when I referred to it as my Jimmy.
Probably because there was such a fondness and legend status for the "Screaming Jimmy" Detroit Diesel Series 71 engines that were mostly synonymous with GMC back then. Detroit Diesel was another division of GM but the engines were often just called GMC Jimmy's.

I have zero problem with someone calling GMC's Jimmy's as a catch-all.
 
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