Speaking without thought; talking like an un-educated person on a subject they know nothing about; giving an answer to a
question that has no relevancy to the question; Sean’s cousin Bob gave a Mumble Jumble answer (not Mumbo Jumbo Dr. Bob).
Bob gave a Mumble Jumble answer to Sean’s simple question about a fishing trip.
Mumble Jumble: define #2
Intense mumbling that some people do in a conference-call when they start discussing something at one end, oblivious of the fact that it can’t be heard – or understood – by participants at the other end.
My tricky question stumped the unprepared team in the US and they went into a mumble-jumble that made absolutely no sense to us at this end.