fiddle sticks are long, slender wooden (usually) sticks that are used to accompany a violinist or fiddler. The fiddle sticks player stands to the right of the fiddler and taps the sticks on the fiddler's strings, much as in the style of a hammered dulcimer.
"Get away from me with those damned fiddle sticks, you nut. I'm trying to play Bach's Chaccone!"
Like the other definitions, a mild sweary word, but used as a get-out when you start to say "fuck" somewhere you can't. Often has a bit of a stutter at the start. Very similar to "sugar", in the sense Lucinda Green used it on television when a British horse missed a fence at the Olympic showjumping.