Definition

To talk persistently, noisily, or at length; to chatter or jabber. The term often carries a connotation of talk that is tedious, excessive, or of little substance.

Example Usage

The politician continued to yabber on about his accomplishments without answering any of the journalist's direct questions.

Origin

Australian English slang, possibly derived from or influenced by Yabber, an Aboriginal language word, gaining currency in the late 19th century.

Fun Fact

Yabber is particularly common in Australian English but has spread to other varieties of English, particularly in Commonwealth nations.

Source: Definition backfill (hailey)