A Megalomart is a term created by the script writers of
Fox's cartoon King of the Hill as a parody term for over-size big box stores. A Megalomart comes into an area, destroys the local competitors by lower volume pricing and becomes "the store" for all working class
people for
miles around. The word is a multiple pun: "Mega" large, "
lo" low as in low prices, and Megalo, from megalomanic, a person under the delusion of their supreme self-importance, and "mart" a place for shopping.