mum ‧ bo-jum ‧ bo /ˌmʌmbəʊ ˈdʒʌmbəʊ $ -boʊ ˈdʒʌmboʊ/ BrE AmE noun [uncountable] informal
[ Date: 1700-1800 ; Origin: Mumbo Jumbo name of a supposed African god ]
technical language that is difficult to understand and seems to have no sense:
a bunch of legal mumbo-jumbo