1 definition by Zsean
Knuckling is the act of 2 bros fist bumping eachother. As the two bros fist bump eachother, a third bro proceeds to slide his dick between the other bros touching knuckles. He then proceeds to fuck their knuckles.
Ben: Are colin and adam knuckling with that guy over there?
Sean: Yeah that dudes dick is gonna be super sore wow.
Sean: Yeah that dudes dick is gonna be super sore wow.
by Zsean January 6, 2018