chat·ter (chtr) v. chat·tered, chat·ter·ing, chat·ters v.intr. 1. To talk rapidly, incessantly, and on trivial subjects; jabber. 2. To utter a rapid series of short, inarticulate, speechlike sounds: birds chattering in the trees.

v.tr. To utter in a rapid, usually thoughtless way: chattered a long reply. n. 1. Idle, trivial talk. 2. Communication, such as e-mail and cell phone calls, between people who are involved in terrorism or espionage, as monitored by a government agency.

(Source: The Free Dictionary - http://www.thefreedictionary.com/chatter)