Etymology/usage/grammar of Hooptedoodle

According to Elmore Leonard: The Dickens of Detroit(The independent.co.uk - 03 September 2004):

"Leonard always strives for invisibility as an author, which is why he warns against hooptedoodle ("You get so tired of people showing off," he says, "they come to a part of the book where they can describe something and they'll spend all day describing the waves coming in"); although he advises that those with a facility for imagery and who like the sound of their own voice need not seek this invisibility.

Also: from Easy on the Hooptedoodle By Elmore Leonard

If it sounds like writing, I rewrite it. Or, if proper usage gets in the way, it may have to go. I can't allow what we learned in English composition to disrupt the sound and rhythm of the narrative. It's my attempt to remain invisible, not distract the reader from the story with obvious writing. (Joseph Conrad said something about words getting in the way of what you want to say.)

If I write in scenes and always from the point of view of a particular character - the one whose view best brings the scene to life - I'm able to concentrate on the voices of the characters telling you who they are and how they feel about what they see and what's going on, and I'm nowhere in sight.

What Steinbeck did in Sweet Thursday was title his chapters as an indication, though obscure, of what they cover. "Whom the Gods Love They Drive Nuts" is one, "Lousy Wednesday" another. The third chapter is titled "Hooptedoodle 1" and the 38th chapter "Hooptedoodle 2" as warnings to the reader, as if Steinbeck is saying: "Here's where you'll see me taking flights of fancy with my writing, and it won't get in the way of the story. Skip them if you want."