[xone]

why, or where the first depiction of a ‘Nimrod’, as a moron occurred

It is in your post:

taken from the biblical King, Nimrod the Hunter, who built the tower of babel

.

[Vaquero]

yeah I suppose...(heck if the Lord is up, that is a good place to look....in primitive sandal wearing culture, I would expect as much from a populace that thinks the sun revolves around the earth)

but that is not, where I believe, the current use came from...I believe it is because it is a funny sounding name...that probably translates to bow and arrow if you think of it(nimble??? rod??? no? whatever.)...and back in the early 60s it was not considered a denigrating term. And I do not think those who use the term today are biblical scholars.