To talk to one about trite or meaningless things in an exhausting, tedious, and lengthy manner, especially without letting the other person respond or engage meaningfully. I got stuck sitting next to Randy at the company dinner, who just yakked at me all night about his fantasy football team.If you're just yakking at your clients about a bunch of numbers and graphs, you probably aren't getting them very interested in what you have to say.
yak at
or yack at
v.Slang
1. To talk at length to someone without regard for his or her interest: My neighbors yakked at me about their new dog for over an hour.
2. To nag someone noisily or peevishly: Her parents yakked at her for getting home so late.