gibber

(noun) unintelligible talking. Synonyms: gibberish.

(verb) speak (about unimportant matters) rapidly and incessantly. Synonyms: chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, tattle, blabber, gabble.

(verb) chatter inarticulately; of monkeys.