A person who will not shut the fuck up,and is just blabbering out mindless dribble. This person just talks about nothing or weaves yarns that just go on endlessly, it's like they have to hear themselves talk. These people may often be refered to as longwinded assholes.
dude 1: That speaker really went on and on at the meeting tonite.
dude 2: Sure did, he was a real rachet jaw.