Blather (verb)

To talk foolishly or at length without making sense; to talk in a meaningless or inconsequential way.

Origin:

Of uncertain origin, first recorded in the late 18th century.

Examples:

1. He just sat there blathering on about his ex-girlfriend.
2. She blathered on about nothing for hours.
3. He could not stop blathering about his new car.
4. The politician blathered on instead of answering the question.
5. The drunkard blathered on about his misfortunes.