Crusty Knuckle 

After someone has fisted another person, they leave their hand uncleaned for a while. The fluids, dry and harden on the hand, forming a Crusty Knuckle, or Crusty Knuckles depending on the severity.

Jasmin fisted Leeroy. She left her hand overnight an the shit hardened. In the morning her hand had turned into a Crusty Knuckle.

Crusty Knuckle by L.Jenkins January 11, 2012

crusty knuckle 

A crusty knuckle is when you have your girl stimulate your prostate by shoving her middle finger up your anus. Look at her knuckle once she is done.

I blew a load so hard while Christina was giving me a Crusty Knuckle.

crusty knuckle by John Chapman June 1, 2007

crusty knuckles 

A condition which sets in after a prolonged session of personal masturbation and falling asleep afterwards. The knuckles of the hand are glued into position from the secreted bodily fluid and is nearly impossible to reverse.

As Jim lay in his favorite recliner, he was awakened by his mothers entrance into his room and was caught with crusty knuckles.

crusty knuckles by Mike Bruce October 3, 2005

crusty knuckles 

pedophile.

man that guy is a fucking crusty knuckles man.

crusty knuckles by REVERENDJOY October 30, 2008

Knuckle Crust 

Dried semen. When remnant semen dries on the fingers after fapping and busting a thick nut all over the hand.

Is that dried skin on your fingers?

Naaahh. I just didn't wipe my fingers to good after fapping this morning. It's knuckle crust.

That's fuckin nasty braaaahhhhh

Knuckle Crust by Eaton Holgoode May 9, 2017