chatterer

intransitive verb

1. to make short, indistinct sounds in rapid succession: birds and squirrels chatter
2. to talk fast, incessantly, and foolishly
3. to click together rapidly, as the teeth do when the lower jaw trembles from fright or cold
4. to rattle or vibrate: an improperly adjusted tool chatters

transitive verb

noun

1. the act or sound of chattering
2. rapid, foolish talk