The unpleasant film that remains in your mouth after eating fast food.
That McMuffin left me with some nasty McMouth!
by Stroo April 7, 2010
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The ability of John McCain to continuously fuck-up what he is talking about - even on the basic things that he is running on.
An example would be when John McCain caught McFoot in McMouth disease and tried to redefine what a surge was because he could remember when it started and accidentally claimed that it started a year before it actually did.
by Cindy McCain July 25, 2008
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