underground school website; unofficial school message board
Refers to unofficial, often anonymous websites or online forums associated with a specific school, where students may share test info, gossip, or engage in cyberbullying. The term carries a negative, hidden-community connotation.
Bullying on underground school websites has become a problem.
He posted past exam questions on the underground school site.
Compound of 学校 (school), 裏 (back, hidden), and サイト (site). The term emerged in the 2000s with the rise of anonymous school-related online forums.