Q:

There be no doing

Plot:

A is a fat woman, and there is a B fatter than A. 
A asked her husband,
  "B's bigger than me, right?" 
Her husband answered, "Yeah, there's no getting around her on the sidewalk."

What is the meaning of the answer? It probably means

Yes, she is bigger than you only if you are all standing on the
  sidewalk.

or

Yes. So, don't stand on the sidewalk with B.

A:

Both are incorrect.
It means

Yes, she is fat. People can't pass her when they are coming across her on
  the sidewalk.

