jibber-jabber /ˈdʒɪbə(ɹ)ˌdʒæbə(ɹ)/noun 1verb 1forms 3 noun1 •(informal) Excessive or meaningless talk.And I would ask counsel to check his sense of humor at the door. My courtroom is a temple of decorum, and I do not tolerate jibber-jabber. — 2006 verb1 •(informal) To talk excessively or meaninglessly.Is my mind goin' on me or am I watching you jibber-jabber like some sort of jibberty box. Jibber-jabber on! Jibber-jabber on! — 2005 formsjibber-jabbered · jibber-jabbering · jibber-jabbers