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1.
Mumbles is a character by Edbassmaster on YouTube. Born in the 60's in Malt Lickie, Texas; he often has trouble communicating with people and often gets frustrated.
Mumbles: Can you put malt lickies on that?

Car Salesman: No, I'm not going to put anything on it.

Mumbles: Well, can you bartle doo the price?

Car Salesman: The price? $12,000.

Mumbles: Right, but can you bartle doo?

Car Salesman: I'm not sure what you mean by that word.

Mumbles: Well, can you just kaypomasodums with the malt lickies?

Car Salesman: No, if you buy, you do it.

Mumbles: I'm gonna buy it! Just kaypomasodums with malt lickies!!!
by Metallica Bass Player August 07, 2010
 
2.
Mumble means "gobbledygook" or worded rubbish. A collection of letters which means nothing at all.
"Woah, that was total Mumble, try saying it again"
by ShirleyAlex November 20, 2005
 
3.
A woman wearing clothing that is far too tight for her , often with no underwear, so that you can see the shape and movement of her genitals. Her lips are moving, but you can't hear what she is saying.
Man, check out Mumbles over there in the cycling shorts.
by Svenyboy August 04, 2005
 
4.
A person who stutters or garbles there words when excited, frustrated or drunk.
If your at a club and your friend is drunk and and gets kicked out of a club. He is Mumbles...
by Miko July 23, 2003
 
5.
Noun: A woman's female parts as viewed through extremely tight pants or shorts.
Her shorts are so tight, you can see her MUMBLES. Her lips are moving, but you can't hear what they are saying.
by paxtonjim September 22, 2008
 
6.
A sexual act in which a robed woman or gay man "motorboats" the scrotal sac of her male partner.
I mumbled Andrew last night, he yelped like a small frightened but happy animal.
by the_mumbler February 05, 2010