constant, endless, incessant
Her constant chatter was starting to annoy me.

excited, loud, nervous, noisy
idle
I wish you'd stop wasting time in idle chatter.

inane, mindless
background
Internet, radio
Enemy radio chatter indicated the plane was carrying weapons.

chatter about
She was full of chatter about her new friends.

excitedly, happily, loudly
endlessly, incessantly
away, on
He chattered on happily for about half an hour.

about
We chattered about work.

to
He chattered excitedly to his friends.

Chatter is used with these nouns as the subject:
monkey, tooth