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

mumblepants 

girls' pants so tight that you can see the lips moving but you can't hear what they're saying

woah! look at the mumblepants on her!

mumblepants by jonny notions October 12, 2005

Mumblecunt 

A person who insists on engaging others in lengthy conversations whilst simultaneously speaking with a total disregard for both diction and appropriate use of volume. In effect taking the act of simply mumbling and elevating it, by way of conversational persistence, to a level of cuntishness. Therefore becoming referred to as a mumblecunt.

Hey Dave we should get going, Terry's coming this way and he's a right fucking mumblecunt.

Mumblecunt by RatBikeNate November 30, 2020

Mumblecunt 

"When a person makes minimal effort to sing along to a song on the communal radio. It is loud enough to hear, but not clear enough to distinguish the words, therefore this person is the most irritating in the office environment.

"Going to have to put my headphones in to try to avoid the mumblecunts"

Mumblecunt by KittyKatPryde June 7, 2019

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

cumblement 

A fight and / or argument

Dad saw mom with another guy and now their in a huge cumblement.

cumblement by lokijki January 26, 2008

Momplement 

To complement someone regardless if their performance / quality is poor or not impressive.

“Oh little jimmy I know you made a mistake and made the team lose all their chances but you’re still the best” is the act of giving a momplement

Momplement by Fishhook November 2, 2018