Como dizer "Crescer cabelos nas mãos (pegadinha)" em inglês

Hair to grow on the palm of your hand.

When an innocent young man is seriously told that masturbation will cause hair to grow on the palms of your hands, he will often immediately look at his hands thus causing raucous laughter from the others. (urban dictionary)

By the way, does masturbation causes hair to grow on your palm?
No, absolutely not!
There are many myths about masturbation and its effects. One is that it causes blindness or grows hair on your hands. This is absolutely untrue. Masturbation also does not create warts or cause STIs. (bettertoknow.yk.ca)