"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."
"Just waanted to go dowanfield and duhduh get the win."
by Stormvessel June 23, 2015
by unstable bob June 30, 2017