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
Get the mash potato mouth mug.