Definition: something foolish or worthless
Flummadiddle is the sort of word that rolls nicely off the tongue, and even if people with whom you use the word don’t quite know what it means the conversation will be the richer for its presence. It has gone through a number of meanings and spellings since it first began being used in the early 19th century, with the earliest use apparently referring to a frill or fringe, as found on a dress.
Following its sartorial beginnings, flummadiddle began to be employed in other fashions; it comes up as a single-word headline for an article in a Massachusetts newspaper, The Salem Gazette, in 1829, without any apparent relation to the text of the article (which is about a walking stick); perhaps the editors of that paper simply liked the way the word looked.
By the middle of the 19th century flummadiddle was used variously as a verb or as an interjection:
L. (Jumping up.) Jupiter! thunder! a tete-a-tete with a vengeance! O, you eternal varmint of a bat–I’ll show you how to flumadiddle around me!
–Spy-Glass, Jul., 1840
O folly, fudge, and flummadiddle! We shall wait and see what next.
–Milwaukee Daily Sentinel, 18 Aug., 1848
The threat about retaining all Mexico is mere flummadiddle, of course.
—Boston Daily Bee, 8 Oct., 1846