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Marble mouth 

"Marble Mouth" is a slang term used to signify people who possess a slight speech impediment. It's hard to describe, but it certainly has nothing to do with location or cultural background like one definition ridiculously stated. It's not that they stutter - they don't necessary. But it's obvious that speaking is not their strong suit and they sound as if they have a mouth full of marbles. Marble mouths, more than anything, are highly annoying because you just want them to spit the words out already.
Eli Manning. A perfect example of a marble mouth.

"Just waanted to go dowanfield and duhduh get the win."
Marble mouth by Stormvessel July 1, 2015

titties in my mouth! 

1. an exclamation of joy or delighted surprise

2. an enthusiastic expression of agreement.
Ashton: Dude, we won!
Harrison: Ahh, TITTIES IN MY MOUTH!
*enthusiastic high five*
titties in my mouth! by GO PRIDE October 19, 2010

Is your asshole jealous of the shit coming out of your mouth? 

An epic burn. Practice so it will roll right off the tongue and and use when people are drinking so that there will be maximum nasal spewage for effect.
loser: blah blah blah...

cool person: Is your asshole jealous of the shit coming out of your mouth?

A Closed Mouth Doesn't Get Fed 

A saying popular among adults, which means if you do not open your mouth you will not get what it is you want.
Jane was too quiet at the birthday party, and when everyone got their food, she was last to get hers.

Mother came to Jane and said 'Why aren't you eating?'

Jane responded 'I do want to eat...'

Mother concluded, "A closed mouth doesn't get fed. Next time open your mouth."

ooky mouth

A game in which you each take turns in spitting in each others mouths, as the giver spits into the mouth of the receiver, the receiver has to try to say 'ooky mouth' with a mouthful of the giver's spit.

Hoover Mouth 

Some one that sucks on a dick like a vacuum
Janes got such a hoover mouth!!!!
Hoover Mouth by Spaci September 25, 2006