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Typically when you finger a girl up to your knuckle. Sometimes when two men try and finger each other.
EX. I got fucker knuckled last night and it felt great!
EX. David and I need to try to fucker knuckle tonight.
As pertains to construction site or job site lingo
A worker or person who is constantly screwing around and challenging rules, playing pranks, smoking cigarettes inside the building, being a general pain in the ass.
Listen here Fucker Knuckle! Rules are rules! If I catch you smoking in my building again, I’m gonna call your boss and have you removed from the jobsite.
smash or pass, pokemon edition
Hello everybody my name is markiplier and today, we're doing fuckle knuckles
When a 300lb person has dimples where knuckles should be because his palms are too fat making his knuckles depressions and then fingers a woman
I want to dimple knuckle her until she cries.
Grundle Knuckle is when the taint is rubbed or massaged to cause a dude to cum
Bruce was getting an old fashioned HJ and Stacy wanted to speed things up and gave him the old Grundle Knuckle to help him cum more.