Green’s Dictionary of Slang

(US) anything for which one has no specific name; occas. attrib.

1920		S. Lewis Main Street (1921) 50: I simply can’t understand all these complications and hoop-te-doodles and government reports. 308: What you need is to get away [...] and go to every dog-gone kind of New Thought and Bahai and Swami and Hooptedoodle meeting you can find.
1954		J. Steinbeck Sweet Thursday (1955) 6: The guy’s writing it, give him a chance to do a little hooptedoodle. Spin up some pretty words maybe.