'Filth knuckle' when you're knuckle deep in pussy and the lass hasn't the best personal hygiene... when your finger(s) come up for breath you have a suspicious brown stain on the back of your knuckle(s).
I've never had such bad filth knuckle as last night... it was like I'd been eating dark chocolate with the back of my hand.
Mens underwear, skivvies, tighty whities, boxers or briefs.
"You can't buy a knuckle Basket like that at BB&B"
A ball sack that looks like a chicks camel toe.
Damn that's hot look at his knuckle bag, I wouldn't mind slapping that around ever once and awhile.
The act of performing an anal creampie (male or female) then proceeding to fist them, shoving the cum deeper into them getting your knuckles white and creamy.
"Hey Julie, was wondering if you were still down for a White Knuckle tonight."
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