The English language has many “goofy” words. They’re fun because they are goofy and also fun to say. Here are a few that don’t appear to have much or any history and for which I could find no sources.
Caterwauling — a shrill howling or wailing noise like that of a cat
Fiddle-de-dee — exclamation of impatience, disbelief, or disagreement (1775-85)
Fiddle-faddle — trivial matters, nonsense, candy-coated popcorn (1570s)
Flummoxed — bewildered or perplexed (1837)
Fooforaw — excessive or flashy ornamentation; a to-do over a trifle
Kerflooey — ceased functioning, fell apart, failed
Kerplop — sound of something falling, especially into water
Picklepuss — someone habitually sullen or gloomy
Piffle — nonsense, an alteration of “trifle” (1890)
Skew-whiff — not straight, askew, lopsided
Wishy-washy — feeble, poor quality, vacillating, lacking in character, (1690s)
This is just the beginning! I love goofy words and there are many more to come.