"Megalovania" is the Greek word for "Megalomania", which means "obsession with the exercise of power, especially in the domination of others". It is also the name of the song played when you fight Sans in Undertale. The song might be called this to relate to the abuse of your power to reset and alter the timelines.
The Megalovania Effect:
Any song that is modified by any means but majority to most of the modified songs still sounds really good. At this point, We can conclude Megalovania is the first to achieve that in human history.
*the one who came up with this is: TwoSling_Mappings on YouTube
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.