Why do people call stars' teachers' now?

people in the entertainment industry like to call each other "teachers" because they are very aware of the situation in the industry (the legend is quite promiscuous). People in the industry who basically have some achievements and status are always "wet" in their crotch, so they often laugh at themselves or tease each other as "old wet" (with the same sound as "teacher"). It was originally a joke, which was inadvertently spread widely and slowly. Such as "Cang teacher".