The exact origin is uncertain, but the phrase is likely connected to the folklore of the fiddle itself. Here are some possible explanations:
* Fiddlesticks as a useless object: Fiddlesticks, as a small stick used to clean out a fiddle, were considered a trivial and insignificant object. This may have contributed to the phrase being used to denote something worthless or unimportant.
* Fiddlesticks as a musical term: The phrase "fiddlesticks" might have been used to criticize poor musicianship or to refer to music that was considered meaningless or frivolous.
* Fiddlesticks as a playful expression: In some cases, the phrase may have been used in a more playful or humorous way, simply as a way to dismiss something or to express disbelief.
While the precise origin remains debated, the phrase "fiddlesticks" is firmly established in English vocabulary and is still widely used today to express annoyance or dismissal of something deemed nonsensical.