Funnydiddle 

The word you say when you can't say f word.

Matt: "Hey girl do you wanna funnydiddle later?"
Bethany: "wtf no Matt."

Funnydiddle by Funnydiddle Man January 30, 2021

fummydiddle 

A favorite word of me & my father. As I've always understood it, it's to try to repair or assemble something intuitively, without really knowing how.

"I'm going to go down to the basement and fummydiddle with the vacuum cleaner."

fummydiddle by Johnno27 February 19, 2017