a)A word used to describe someone who mumbles; Someone who you have no idea what they are saying because they are either far too quiet, or they are mumbling (could be a combination of both)
That girl is a mumblemouth, no one can understand her.
by danax16 June 24, 2010
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A knowledgeable grey haired professor, who has a habit of literally mumbling while delivering a lecture, making it hard to comprehend.

Derivation- Inspired by the definition of the word mumblemouth on urban dictionary.
Professor Pandey warned his colleagues- " Speak loud and clear! Or else students will call you Professor Mumblemouth. "
by Nodcrafty charlatan March 15, 2022
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