What does big mom mean?

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

Big Mom is a term for some older women. Big moms are usually a happy group of people, such as the older women who dance in the square, known as square dancers.

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".