First point.
Not originated, although you'll find this claim in many places. The AUE
FAQ points out the the slang meaning of "stupid person" is found earlier
than Bugs Bunny. The AUE FAQ entry begins with the Biblical figure, and
then says:
---------------
http://www.alt-usage-english.org/excerpts/fxnimrod.html
... In contemporary U.S. slang, "nimrod" means "fool, numbskull".
Rex Knepp ingeniously suggested that the origin of this was Bugs
Bunny's taunt of Elmer Fudd: "So long, Nimrod." Unfortunately for
this theory, Jesse Sheidlower says that Random House has two
citations of "nimrod" = "numbskull" from the 1930s, before the Bugs
Bunny episode containing the taunt.
Ben Zimmer gave us the two Jesse Sheidlower citations:
Jesse Sheidlower supplies the following from the Random House Historical
Dictionary of American Slang:
----------
1932 Hecht & Fowler _Great Magoo_ 183: He's in love with her. That makes
about the tenth. The same old Nimrod. Won't let her alone for a second.
1934 de Leon & Jones _You're Telling Me_ (film): Little too much whip in
that club, nimrod.
----------
Ben Zimmer added:
Neither citation appears in a context supporting a reading of
'hunter', he notes. I see that the 1934 citation is from a W.C. Fields
movie, and this may have been the immediate inspiration for the Warner
Bros. writers, just as Abbott & Costello's 1941 movie "Buck Privates"
may have inspired Bugs' subsequent use of "maroon". Both Fields and
Abbott/Costello were frequently imitated in the Warner Bros. cartoons
(see <
http://members.aol.com/EOCostello/> for examples). -- Ben
-----
Second point.
The final point to add is that "nimrod" was slang for "penis" in the
late 19th-early 20th century. It was in the 1984 Partridge's (i.e. UK)
"Dictionary of Slang and Unconventional English. How many slang words
for penis or masturbator have gone the route of meaning stupid loser?
Third point.
Although people blithely say over and over they remember Warner Brothers
cartoons with Bugs calling Elmer Fudd a nimrod, it's very hard to prove
this. There's some evidence it may have involved Daffy Duck or Yosemite
Sam. In 2000 Evan and I both found an isolated WAV file of Bugs saying:
[Eh or Neh] I couldn't do that to the little nimrod.
but that website and others are no longer working, and even the maker of
that site had no clue to the year and episode.
--
Best -- Donna Richoux