Jabber

Webster's Dictionary of the English Language

·noun One who jabbers.

II. Jabber ·noun Rapid or incoherent talk, with indistinct utterance; gibberish.

III. Jabber ·vt To utter rapidly or indistinctly; to Gabble; as, to jabber French.

IV. Jabber ·vi To talk rapidly, indistinctly, or unintelligibly; to utter gibberish or nonsense; to Chatter.