Mumblemouth 

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.

Mumblemouth by danax16 June 27, 2010

Professor Mumblemouth 

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. "

Professor Mumblemouth by Nodcrafty charlatan March 15, 2022

mumbleforth 

a bumbling individual. Who is prone to asking ridiculous questions and who does not understand adverts. A notorious sufferer of hungry bum syndrome and giraffe neck.

A fan of unusual culinary dishes such as the little known 'pasta, tuna and a whole tomato'

'no mumbleforth you are wrong again'

mumbleforth by team noadivik December 29, 2007

Mumbleboth 

A derogatory term for someone mumbling nonsense and generally bothering people

Usually applies in social situations where an incoherent person is causing a nuisance

Check out that mumbleboth over there.
Stop mumblebothing me dude.

Mumbleboth by pigeondigger June 30, 2019