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1.
Similar to penis wrinkle, it is a term used to describe a useless person. Think about it, how useful would it be for a dick to have a knuckle?
Jimmy - "I ate the rest of your chicken."
Buddy - "What a dick knuckle."
af Stumpie 20. september 2005
 
2.
When a well endowed man wraps his long flaccid penis around his fist and punches his significant other with it.
Yo Tyrone totally dick knuckled Shaniqua last night. All Hail the DICK KNUCKLES
af Thug Nasty 187 9. november 2013
 
3.
Referring to a person who performs various acts with their hands on a penis
That girl there has some serious dick-knuckles, she'll jerk you 10 ways to Sunday
af pollock1 22. september 2010
 
4.
Similar to a "Goose Egg", which occurs when a person is hit in the head and a swollen lump appears. The one difference is that this Goose Egg occurs in the genital area rather than the head, forehead, etc.
Person 1: Dude I just got done filming my own Jackass show to put on youtube

Person 2: Really? How'd it go?

Person 1: It was funny, but I ended up getting hit in the balls with a teeter-totter. Now I have dick knuckles, great.

Person 2: Wtf is a dick knuckle?
af YourMom'sBoyfriend 15. februar 2011
 
5.
The top and or head of a penis, used to describe a violent verb that involves the top or head of a penis.
Aw man, I zipped my Dick Knuckle up, son of a *****.
af chrischin2332 28. januar 2011
 
6.
Dick Knuckle is when during an erection your penis is bent too far back or forwards and makes a loud pop.
Roxxy was riding my fat cock and leaned too far forward and I got a serious dick knuckle, OUCH!

While masturbating I decided to press down on my penis and I totally gave myself a dick knuckle!
af Burks 10. august 2009