Definition of jabber verb from the Oxford Advanced Learner's Dictionary
jabber
verb
ˈdʒæbə(r) ˈdʒæbər
[intransitive, transitive]jabber (about something)| + speech (disapproving) to talk quickly and in an excited way so that it is difficult to understand what you are saying
Synonym
gabbleWhat is he jabbering about now?jabbernoun[uncountable]