chatter about (someone or something)
To talk idly, incessantly, or excitedly about someone or something. Why are all of these people suddenly chattering about me? Well, he's still chattering about how wonderful this program is, but I stopped listening a while ago.
chatter about someone or something
to talk idly and actively about someone or something. All the guests were chattering about something or other. People are chattering about you and Claire. Do you want to know what they are saying?