Green’s Dictionary of Slang

(US) excessive conversation.

[1911		E. Dyson ‘Barracking’ in Benno and Some of the Push 146: By the holy, you’ll get it agin if you give me too much iv yer gibber].
1954		B. Appel Sweet Money Girl 135: She aimed the light on the sucker’s palm. ‘Gods of Fate,’ Madame Shouria began again. He didn’t like it one bit. He squirmed around like he didn’t want to buy any of this gods-of-fate jibber-jabber.
2000		Ebonics Primer at www.dolemite.com 🌐 jibba-jabba Definition: an excessive and untimely amount of conversation having little to do with the matters at hand. Example: Ain’t got time for no jibba-jabba!
2022		J. Hannaham Didn’t Nobody Give a Shit 67: This kind of [...] shit-talking made up 99 percent of the jibba-jabba anyone ever stepped to her with in Ithaca.