1600. DEKKER, The Shoemakers Holiday, in wks. (1873) i., 21. Hees some uplandish workeman, hire him good master, that I may learne some GIBBLE GABBLE; twill make us worke the faster.
1659. TORRIANO, Vocabolario, s.v.
1748. T. DYCHE, A New General English Dictionary (5 ed.). GIBBLE-GABBLE (s.), silly, foolish, idle talk.