Mumblebug 

To be a person who mumbles on the reg.

"mmbmmmbmbmmfmmmn"
"speak up you mumblebug"
"i said how areyou, you cunt"

Mumblebug by Archemedes Bonk III November 16, 2011

mumblefuck 

An unintelligible answer to a simple direct question.

My car salesman gave me a mumblefuck answer when I asked if the car was ever used as a taxi cab?

mumblefuck by BigjonnyC January 19, 2008

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

mumblebrag 

When someone tries to slip in a humblebrag but the person they're speaking to doesn't care and stopped listening.

"Man I am so tired today"
> "... ok"
"Yeah I was up late working on my microbrew recipe"
> "oh"
"I won an award last year for best-" mumblebrag
> *gets off elevator*

mumblebrag by typhdotcom August 7, 2016

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

wandering mumbleguts 

(n). A person who habitually rambles on while talking incoherently in an inaudible or soft tone of voice, often in a boorish monotone.

Oh no, lets go make ourselves look busy. Here comes that wandering mumbleguts.

wandering mumbleguts by Dave Hultgren February 26, 2004

Murblebumble

A common response to a "grumble."

var. -
*Murbumbler, one who murblebumbles. (noun)
*Murbumbly, when something seems similar to murblebumbling.

I so murblebumbled that gurgle!
I want to be a murbumbler when I grow up!
Travis is being so murbumbly to Lizby today!

Murblebumble by Lucke & Lizby January 22, 2009