What is the meaning of the lyric "don't answer the phone 'udden udden'"?

Solution 1:

So, I can't find much online either regarding 'udden, udden', nor am I sure what the correct spelling would be, but it's definitely a reference to reving the engine. I'm from rural NW Tennessee, and this is the onomatopoeia my mother uses with small children when playing with cars or other engine-powered vehicles (she's lived her whole life in that area).

I've also seen it used often with a motorcycle throttle hand motion. Generally a "double rev" for lack of a better description, where the timing is such that the 'ud' is timed with the twist back to rev up, and the 'en' is the return to idle.

And yes, I believe 'answering the phone udden udden' means when he picked up the receiver, the engine was revving on the motorcycle'

Edit: Here's an example from Bobby Allison (a famous NASCAR driver) discussing his son's first non-crying sound being an engine.

"He was my little buddy from really early on," Bobby Allison said. "He would sit on that seat beside me, those little eyes just wide open, looking around. And the first noise I ever heard out of him, other than a baby crying, was 'Uddn, Uddn.' I said, 'That boy is all right!'