Similar to Persian sunglasses. The act involves waiting until someone has fallen asleep (usu. through intoxication) Then, in order to perform the act, another person positions themselves above the sleeping party, and dropping their testicles over the sleepers eyes, with their penis laying down over the nose. Therefore resembling the iconic "Groucho Marx" disguise.

to sport a boner, fly the sail at full mass, rock hard, etc.