My question: Does the expression have a figurative meaning? (Basically, what does it mean?)
I'm also curious about the origin and when it is usually used. Any ideas?
The expression is used in the following sentence:
It’s often by listening for the vibrations in the muck that one can pick up on the big moral conflicts looming ahead.
— Rachel Marsden: Can Mankind Survive the Onslaught of the Robots