When a guy has one leg and when you ask to rub it in return he asks you rub the other nub (his peener)
That guy has a prosthetic leg, I wonder if he would let me rub the nub. He would probably ask for payment. At that point I'd be double nubbin
When a man puts his finger up a girls ass and spins her like a basketball.
*menacingly* “Dirty nubbin time“