Here is an accurate definition of the term Megalovania.
Basically the word 'megalomania' combined with 'Transylvania', which means 'other side of the woods'.
So basically, you're almost out of the woods but you're being punished for your megalomania.
if this is true, then this should make hopes and dreams also frisks theme, as frisks hopes and dreams are pushing her determination through the battle, as well as act menu options being hope, and dream
stfu megalovania is sans theme
here's a quote from sans that is not in game but makes sense
"i fight a megalomaniac so i name my theme MEGALOVANIA"
and according to toby fox. its a combination of Transylvania and Megalomaniac words
Transylvania is a movie that contains vampires, frankeistein, mummys and SKELETONS
JUST A FRIENDLY REMINDER THAT MEGALOVANIA IS NOT SANS' THEME. MEGALOVANIA IS ACTUALLY A REFERENCE TO THE WORD MEGALOMANIAC, WHICH IS FOCUSING ON THE PLAYER WHO HAS KILLED ALL THE MONSTERS TO GAIN POWER. SO MEGALOVANIA ALSO INCLUDES THE WORD LOVE WHICH IS AN ACRONYM, L.EVEL O.F V.IOLENCE. THIS ALSO REFERS TO THE PLAYER. IN CONCLUSION MAKING MEGALOVANIA THE PLAYERS THEME IN GENOCIDE WHEN THEY HAVE BECOME THE MEGALOMANIAC.