Result of smoking copious amounts of spice, i.e. extremely dry mouth, very limited saliva, and also dry eyeballs in severe cases.
Javier was unable to eat his hot dog because his mouth was completely dry as a result of his potato mouth.
by Smokeyspicey May 2, 2011
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The action in which one tries to speak and a fully formed sentence is not formed. There are fragments and random words. The person is intently trying to form a sentence and make a point, but the sentence is incomprehensible. There is usually an utter of words and the spew of grunts and/ or the word uhh. This action is usually accompanied by a blank stare or glazed look.
I went to talk to him, but he started mash potato mouthing everywhere. He is real hard to talk to.
by zinna rose January 18, 2012
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From The Jon Stewart Show, a description of particularly stupid people.

Not to be confused with "Rocks with mouths."
Those people are so stupid, they are like potatoes with mouths.
by D9 GM September 1, 2010
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