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fudge knuckle 

to fist a male or female anally.
guy 1: did you go on that date last night?

guy 2: sure did, we went back to hers, she even let me fudge knuckle her.
fudge knuckle by mykiemegatron April 23, 2010

Clammy Knuckle 

Upon fisting a girl, one withdraws their hand only find the moisture content on their appendage is significantly higher than normal.
"Dude I've a cramp and i've also got a bit of a clammy knuckle..."

"Awh dude thats savage..."
Clammy Knuckle by Bob Paul III March 5, 2008

Slut Knuckle 

When a girl gives you a handjob and in the process get jizz on her knuckles and then proceeds to punch the man in the face with that same hand.
I got a slut knuckle my face was sticky afterwards.

Spunk Knuckle Duster 

When your girlfriend gets spunk all over her knuckles after wanking you off and threatens you in a comical manner with the "spunk knuckle duster".
Girlfriend to boyfriend after wanking him off *she brandishes fist* "I'll punch your face in with my spunk knuckle duster you minger!"

poo knuckle 

The slightly less pleasurable, but still delightful act of receiving a handjob while taking a shit. The predecessor to the blumpkin.
Stephens girlfriend was too stingy to give him a full blown blumpkin, so she elected to give him a poo knuckle. He was meagerly satisfied.
poo knuckle by theTHICKNESS December 27, 2011

Fuck Knuckle 

Someone who is intensely stupid, useless, or just plain ignorant.
"You can't clean a toilet with a rake, you stupid fuck knuckle"
Fuck Knuckle by MichaelMayfall December 29, 2014