noun / verb
gabble
GAB-ul/ˈɡæbl/
Fast speech that is hard to understand.
Her excited gabble makes the directions almost impossible to follow.

Etymology
Gabble may be a frequentative of gab, suggesting repeated or ongoing talk, or it may imitate speech sounds. Its established sense emphasizes talk that is rapid, noisy, and hard to understand.
More examples
- He gabbles when he gets nervous.
- She gabbled something about missing the bus.
- I can barely catch a word of their gabble.
Forms
gabble · gabbles · gabbled · gabbling
gabbler noun — Someone who speaks rapidly and unclearly.