Megalovania was composed by Toby Fox and became widely known as the theme for Sans during his boss fight in Undertale, released in 2015. Its fast, looping riff became shorthand online for an unexpectedly difficult fight. Megolovonio is a playful misspelling and remix name that spread through soundboards and meme edits, where users share the short sting under that title. The variant keeps the recognisable melody but packages it for quick reactions, which is why it still appears in gaming videos, Discord chats and prank posts.