Hi.The first person to arrive on his side of the barrier was i chubby guy driving an old GMC pickup. Barbie recognized him from Sweetbriar Rose: Ernie Calvert, the previous manager of Food City, now retired. Ernie was staring at the burning clutter on the road with wide eyes, but he had his cell phone in his hand and was ratchet-jawing into it.
This is Under the Dome by Stephen King. What does ratchet-jawing mean in this particular context?
Thanks in advance.