When a gay man, or woman/ straight man, or woman shoves their hand up there partners ass then pulls out there shit then chucks it at the wall, or in there partners face
Hey girl wanna do the monkey knuckle
The act of stroking one's penis with such vigorous strength and aggression that it causes one's knuckles to turn white.
Bro, it's been so long since my girl let me hit that I had to give myself the ol' white knuckle monkey fist.