Top definition
A symptom that often accompanies "Verbal Diarrhea"
Example 1:
Mike Germanaro is an excellent example of runmouth. He suffers from diagnosed "Verbal Diarrhea/Full-Of-Shitness."

Example 2:
Person 1: Hey look at all the gaps in that guys teeth!
Person 2: Yeah, I heard that's what happens when you're a runmouth fucktard!!!
by PAforIdiots June 06, 2010
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