Jabber

Part of speech: noun (n.)

Rapid or incoherent talk, with indistinct utterance; gibberish. Swift.

Part of speech: noun (n.)

One who jabbers.

Part of speech: verb (v.)

To talk rapidly, indistinctly, or unintelligibly; to utter gibberish or nonsense; to chatter. Swift.

Part of speech: verb (v.)

To utter rapidly or indistinctly; to gabble; as, to jabber French. Addison.