The act of polishing and or shining another person's knob, 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"
"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."
Prices shown in USD.