Unmasking The Meaning And Marital Disputes Behind Mumbo Jumbo : Code Switch : NPR: "Bureaucratic mumbo jumbo," "legal mumbo jumbo" and "religious mumbo jumbo" are all phrases used to describe language or a set of rules and regulations that are deliberately confusing.
The term "mumbo jumbo" has a history that dates back centuries and traces its roots to Africa.
Historians and etymologists say the exact origin of the word is uncertain, but the Mandinka word "Maamajomboo," which referred to a masked male dancer who took part in religious ceremonies is often cited as the source of 'mumbo jumbo' in English. (The Mandinka people of West Africa make up the largest ethnic group in what is now Ghana.)