continued stimulation of the head of the penis after ejaculation, when it's become uncomfortable, usually accompanied by verbal taunting and usually while the male's hands are tied out of the way.
The act of polishing and or shining another person'sknob, a.k.a., their penis tip.
"Ey Boy i'll polish dat knob for fitty cent."
"That Bob Dylan is so hot I'd polish his knob fo free!"
"Got a knob? I'll polish it"
"What was Becky doing out back with Josh?"
"Oh I caught them last time, she was polishing his knob"
"Wow..."
"Yeah she did a good job from what I saw. That knob was clean as a whistle."
"So, you want a job. What are you good at?"
"Polishing your knob."
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.