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1. Similar to motor-mouth; Someone who talks excessively to no end and about many things at once.

2. Having a crooked or eccentrically shaped mouth that is seemingly rubber-like.
"She was sort of muckle-mouthed. I mean when she was talking and she got excited about something, her mouth sort of went in about 50 directions, her lips and all."
-Holden Caulfield of Catcher in the Rye
by TheseWords December 14, 2007