a) someone who never stops [talking] long enough to [think]
b) someone who never stops [talking shit] long enough to [think]
c) someone whose ability to stop talking, or talking shit, has atrophied
> He's a talking asshole who knows plenty of women.
> He was acting like a talking asshole at the funeral.
> "For a while you could see the silent, helpless suffering of the brain behind the eyes, then finally the brain must have died, because the eyes went out, ... ." - William S. Burroughs