yack on (at one)

yack on (at one)

To talk (to one) in an exhausting, tedious, and lengthy manner, especially about something trite or meaningless. I got stuck sitting next to Randy at the company dinner, and he just yacked on and on all night about his fantasy football team. If you're just yacking on at your clients about a bunch of numbers and graphs, you probably aren't getting them very interested in what you have to say.
See also: on, yack
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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