Definitions by L1feLus7

Knuckle-fuck 

The act of sexy punching (fisting).

Margaret, come here. I wish to give you a knuckle-fuck

Knuckle-fuck by L1feLus7 December 3, 2009

Crimson knuckle-fuck 

The act of fisting a girl when she's on her period.

I gave the missus a crimson knuckle-fuck last night.... it got messy.

Crimson knuckle-fuck by L1feLus7 April 1, 2009