To talk thick and fast, as great praters usually do, to chatter like a magpye; also to speak a foreign language. He jabbered to rne in his damned outlandish parlez vous, but I could not understand him; he chattered to me in French, or some other foreign language, but I could not understand him.
JABBER
Meaning of JABBER in English
Slang English vocab. Английский сленговый словарь. 2012