noun. Um, your definition is as good as mine. Help?
Real citation: "Well, every single one of them broke the look off after less than a second. Even when I was smiling, even when I had a silly-ass grin on my face from singing along (like 70% of the people in the bar) to old songs...just a near-instant look-away. Fuck-diddly-ola. I can't tell whether I'm just that ugly, or whether I'm intimidating for some reason."
(CarterBoe, Feb. 8, 2003, http://www.forumopolis.com/dff/showthread.php?s=17d193509e78012db7fb18dea382da2e&postid=717710)
Made-up citation: "Maybe 'fuck-diddly-ola' is a unit of measurement in the neighborhood of jack-diddly-fucking-shit-squat."