When you finger an asshole and only realise you still have shit under your nails when having a sip of beer at the pub. You grab a coaster to scrape the shit out.
Sneaky Fingers is referred to someone that uses there fingers to do un-catholic things to people, Sneaky fingers can also be referred to someone who doesn't give a fuck about rules and just does whatever they want to someone.
"damn andrew has sneaky fingers with madi"
"lol alex your never gonna use your sneaky fingers"
"alex you used your sneaky fingers with your cousin"
"yeah baby come on give me ur sneaky fingers"