verb / noun
jabber
JAB-er/ˈdʒæbər/
Fast, excited talk that can be hard to understand.
The speaker's excited jabber overwhelms the listener trying to take notes.

Etymology
Middle English jablen already referred to rapid, indistinct speech. The word is probably ultimately echoic, suggesting an imitation of the sound of such talk.
In context
to jabber to talk in a way that people can't can't understand you
More examples
- I can hardly hear the announcement over their excited jabber.
- She jabbered about her trip without pausing for breath.
- Everyone is jabbering at once, and I miss the directions.
Forms
jabber · jabbers · jabbered · jabbering
jabberer noun — Someone who talks rapidly and indistinctly.