mumbo-jumbo
Concise Oxford English Dictionary © 2008 Oxford University Press:
mumbo-jumbo/mʌmbəʊˈʤʌmbəʊ/
▶noun informal language or ritual causing or intended to cause confusion or bewilderment.
– origin C18 (as Mumbo Jumbo, denoting a supposed African idol): of unknown origin.
'mumbo-jumbo' also found in these Oxford entries:

