Exactly what it says in the tin- A literal statement along the lines of “Stupid people shall rule the world”.
Both a catchphrase and a war cry. Often said ironically, as the people saying this usually dislike Trendy Kid degeneracy.
Variations of the phrase include “Idiocy Shall Reign Bois” and “Idiocy Shall Reign, Your Mom, Ratio.”
Sometimes said/sung while bouncing around and/or T posing.
Ezra: By any chance, do you know why Isaiah and Jeremiah got into another fistfight?
Noah: Because IDIOCY SHALL REIGN BOIS!
Ezra: WOOT WOOT!