(2) A person who talks too much, to the point of ad nauseum.
(3) It is also a 30 minute cartoon created in the 1970s by Hanna Barbera. It used to be part of the Saturday morning cartoons. It was created with a format and writing that was similar to that of Scooby-Doo and Josie and the Pussycats.
An individual at any social gathering who, typically due to being under the influence of a controlled stimulant (ie: cocaine, amphetamine, adderall, etc.), absolutely refuses to stop talking, interrupting others, or any other general form of jabbering.
"Oh no, everyone duck, I'm pretty sure that fucking Jabberjaw is zeroing in on us."