To masturbate. Jack off. Rub one out.
Roger was late to class because he stopped at the bathroom to knuckle one.
I had to knuckle one to your mom last night.
The act of vigorously scrubbing one's anus, usually with hot soapy water, to clean it of leftover fecal matter. It is more a practical technique than a pleasurable one, although some people find it serves the dual purpose.
The toilet paper at the resort was of poor quality so I had to hop in the shower and do a quick knuckle scrub before going to dinner.
When you're wearing a thong, and your balls are so saggy that each ball falls onto both sides of the thong creating newton ball like balls, and you have someone put their tongue in between both balls, and swing the balls together like newton balls. :)
i'm going to Mewtons Knuckle you so hard your taste buds will never work the same.
When fisting someone's anus, and you pull your fist out covered in poop.
I can't believe they didn't clean themselves enough to prevent me from getting monkey knuckles.
The outline of the edge of a guy's glans ridge through his underwear or pants.
Check out that guy's gorilla knuckle- he's got it pierced!
1. The sound you hear after being punched repeatedly. This is usually accomplished by a bully of some sort.
2. The sound of a habitual knuckle-cracker, especially one who is capable of cracking many knuckles at once.
"Oh man, Jimmy's probably hearing a knuckle symphony right now! Lets call an ambulance."
"Hey, man, thanks for the knuckle symphony right there. Really appreciate it."
Finger fucking a guy's girl under the table at a bar while he is at the table, then punching him in the face afterwards, karate style, with two fingers, like Chuck Norris.
I knuckle cocked that douchebag and took a shot of Jack to top off the night.