Someone who vigorously masterbated frequently. Also, has no scruples for the time or place that the masterbatory overtones eminate from.
Places to cath these deviants:

The porta-potty at a Britney Spears concert.

A bathroom stall during the senior prom.

The toilet while at a raging party.

In the parking lot waiting for a friend to buy a soda at the mini-mart.

At a sleepover at a friend's house while everyone is asleep.

Your mom's house during dinner.
Jimmy is such a SPUNK KNUCKLE. He was caught jerking himself by my aunt in the bathroom stall at the funeral for her dead cousin. What a Battered Cavern!
by e-rips October 14, 2003
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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!"
by Freakosaurus April 8, 2011
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A guy called James Murphy that runs the Property Scale Up Accelerator training company claiming to have 0 - 120 properties in 12 months and to be cashflowing on 200 in 2 years that has never filed accounts for more than a couple of grand at companies house.
🤦 ♂what a spunk knuckle.
by Martoon32 March 21, 2021
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