the GNU version of the Collaborative International Dictionary of English
n. a person who talks excessively.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who talks incessantly
Word Usage
"That would include certain motormouth Black Ph.D. s, and the sort of media pundits who have much to say about the Black community, but who are rarely ever seen in any Black community except when it's time for a drive-by photo opportunity."