A hand job or male masturbation with 1, 2, or 3 knuckles of a finger in the anus to stimulate the prostate and cause a sudden intense orgasm.
Dude, I finally got a 3 Knuckle Chuck! I came everywhere!
You're definitely gonna buck when she hits you with a 3 Knuck Chuck!
Placing a Keurig cup on your penis and then receiving a prostate massage until you ejaculate into the cup. You then drink it like a shot.
Dude the tubing party was so early, I saw Caleb and Travis give one another a Keurig Knuckle to wake up.
When one inserts his/her fingers, one by one, into his/her cousins rectum. Snapping each finger backwards until all are broken.
Wife: Give me an Alabama knuckle popper.
Husband: WTF!!!
Wife: Put your fingers in my ass, and break them.
Husband: NO!
Wife: DO IT PUSSY!
When you're prairie dogging it so hard it makes the ass of your pants protrude.. much like a moose knuckle but with feces..
Oh man I was so close to shitting my pants that I had a fudge knuckle..
When you have uncontrollable rectal leaking and it ends up all over your testicles and inner thighs. You reach down to check what has happened and your hands and knuckles get covered in the devils fudge.
Phil : I am so embarrassed, i ate a dodgy vindaloo last night and it has played havoc with my nether regions.
Damo : how could you tell what had happened?
Phil : i reached down to check and ended up with a bloody fudge knuckle !
Damo : i have to go now, i think i left the iron on....