jabber

1. V-I If you say that someone is jabbering, you mean that they are talking very quickly and excitedly, and you cannot understand them. 含糊急促地说话[表不满]

The girl jabbered incomprehensibly. 这个女孩含糊急促地说着难懂的话。

After a minute or two I left them there jabbering away. 过了一两分钟我就走了，留下他们在那里叽叽喳喳说着。