* "Fiddle" and "sticks": The most likely explanation is that it combines the word "fiddle" (a musical instrument) with "sticks," which might have been a slang term for something useless or worthless. This makes sense as the phrase is often used to express disbelief or annoyance.
* "Fiddlestick" as a tool: Another theory suggests that "fiddlestick" was a real tool used by weavers, resembling a small stick. Over time, the term might have been adopted to describe something that was "trifling" or "unimportant."
* "Fiddle" and "sticks" as a game: Some believe the phrase originated from a game played with sticks, similar to "jacks" or "knucklebones."
It's important to note that the exact origin is debated, and there's no definitive answer.
The earliest recorded usage of "fiddlesticks" dates back to the 17th century, appearing in plays by Shakespeare and others. This suggests it was already a common expression by that time.