Yammer

yammer
noun. A loud and sustained or repetitive noise.
verb, intransitive. To make a loud, repetitive noise. To talk volubly.

Rudy stood next to his brother John in the doorway to the kitchen. Yes, Michael was yammering on, as usual, despite being warned only the day before. He turned toward John as he gestured at the voluble baker.

"Listen to that! He never shuts up. I told him we couldn't have this going on in the kitchen all the time. Evidently, he can't control himself."

John looked on with a look of genuine amusement, to Rudy's disgust. "You're right. I don't think he can."

"What are you going to do about it? You hired him."

John was silent for a moment, watching the kitchen's occupants. While Michael held forth, the rest of the staff continued working, merely glancing at him from time to time. Occasionally one would utter a remark, when Michael paused for breath. The man was the most animated person in the kitchen, not only working the dough on the table before him, but windmilling his arms to emphasize a point every few sentences.

"I'm not going to do anything. He produces as much as any two other employees, and his product is topnotch. He's not distracting the others. See? Everyone is working." He turned to his brother and narrowed his eyes. "You don't like what he's saying, do you? That's why you brought this up. Get over it." He turned and went back to his office, leaving Rudy watching the scene in the kitchen, his face crumpling into an expression of sour discontent.

Definitions adapted from The New Oxford American Dictionary, Oxford University Press, Inc., 2005 (eBook Edition, copyright 2008), and from Webster's Seventh New Collegiate Dictionary, G. & C. Merriam Company, Publishers, Springfield, Massachusetts, USA, 1965, depending on which is more convenient to hand.