What is the meaning of rural big mom?

Big Mother, generally refers to the wife of an uncle, also known as aunt, big mother.

Big Auntie is the name given to some older women. Big moms are usually a happy group of people, such as older women who dance in the square, called square dance moms.

Wall Street predators at the behest of the Federal Reserve raised the butcher's knife of shorting gold, but unexpectedly halfway out of a group of "Chinese amazons", referred to as "big mom".