The phrase soccer mom generally refers to a married middle-class woman who lives in the suburbs and has school age children. She is sometimes portrayed in the media as busy or overburdened and driving a minivan. She is also portrayed as putting the interests of her family, and most importantly her children, ahead of her own.
The phrase soccer mom derives from the literal, specific description of a mother who transports and watches her children play soccer. It was also used in names of organizations of mothers who raised money to support their children's soccer teams.