Came across this:
The woman had appalled Mr. Martin instantly, but he hadn't shown it. He had given her his dry hand, a look of studious concentration, and a faint smile. "Well," she had said, looking at the papers on his desk, "are you lifting the oxcart out of the ditch?" As Mr. Martin recalled that moment, over his milk, he squirmed slightly.
Extracted from: The Catbird Seat by James Thurber
Does over his milk imply "while he was drinking his milk"?
In addition, Is are you lifting the oxcart out of the ditch? an offensive statement? What does it imply? I already think it implies someone pretends to do an important job while the job is not that important or When someone is trying to do something very difficult.