talkaholic

Adjective

 * Of, pertaining to, or characterized by incessant talking.

Noun

 * 1) An incessant talker.
 * 2) * 1984, "Are you a Talkaholic?", New Woman, vol. 14, issues 1-6, p. 194 (Google snippet view):
 * If you are a Talkaholic, you throw out words as you would darts to keep people away from you.