Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: Mumbo Jumbo name of a supposed African god

mumbo-jumbo

 noun
     
mum‧bo-jum‧bo [uncountable] informal
technical language that is difficult to understand and seems to have no sense:
a bunch of legal mumbo-jumbo
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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