When a male dips his ball sack in melted chocolate and then places it over a person's eye's(usually a girl). After all this has taken place, it will look like Zoro's mask that he has in the movies.
While having anal sex with a girl, one pulls out, flips the girl around to her back, punches her in both eyes and proceeds to write a large "Z" on her chest with the feces on his dick.
Straight after anal sex, the man whips his cock out of the womans ass and slaps her in the face with it numerous times untill her face is covered in shit, much like a face pack. Then with two strikes of his wang he creates a 'Z' on her forehead, creating a Mask of Zoro. NOT to be confused with a dirty gomez/sanchez.