Blatherskite

Definition: A person who talks at great length without making much sense.

Example: “The cable TV commentator was a blatherskite who produced 30 minutes of angry nonsense each night.”

Etymology: mid 17th century, from blather + skite, a Scots derogatory term adopted into American colloquial speech during the War of Independence from the Scottish song “Maggie Lauder” by F. Semphill, which was popular with American troops.