WRONG:

MUMBLE JUMBO, MUMBO JUMBLE


RIGHT:

MUMBO JUMBO, MUMBLE JUMBLE


The original and by far the most common form of this expression referring to superstitions or needlessly complex and obscure language is “mumbo jumbo.” “Mumble jumble” is far less common, but still accepted by the Oxford English Dictionary as a variant.


But the hybrid forms “mumble jumbo” and “mumbo jumble” are just mistakes.


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