To mess with someone in a playful way.
Luke: You bathe in your shorts
Heather: Why would you say that????
Luke: I was just fiddling your whistle calm down!
Similar to a diddle club... when a rich, usually a man, buys something like a young boys hockey team, with the intention of gettin’ kinky
Mr. Burns bought the Stars as his personal fiddle club.
Having sexual genitalia intercourse with a first or second cousin
I was in my family and god damn I wanted to play the Alabama fiddle on Jenny
an invalid variant of fiddlesticks.
Dalton: oh fiddle biscuits
Matt: it's FIDDLESTICKS, dipshit