Abalone, called fish, is actually not a fish. It is a primitive marine shellfish and single-shell mollusk. Because it is shaped like a human ear, it is also called "sea ear". Abalone usually grows on the seabed with low water temperature, covering the Pacific Ocean, Atlantic Ocean and Indian Ocean. It is recognized that the best producing areas are northern Japan and Mexico, and the northeast is also a traditional producing area. Among the 2 16 species of abalone named all over the world, 7 species are distributed along the coast of China, among which Haliotis discus hannai in the north of Bohai Bay and Haliotis diversicolor in the southeast coast are the most common.
Because female genitalia is similar to abalone in appearance, some netizens who are not very interesting in thinking associate the two. Because this association is filthy and dirty, there is a saying that abalone is dirty.
Its meaning can be understood as a person's dirty mind and low taste, linking abalone with genitals.