Megalo

derived from Ancient Greek (μέγᾰς m. / μεγάλη f. / μέγᾰ n.)

Meanings are:

big, large

great, mighty, loud

marvelous, awesome

actually the same word that the prefix "mega-" means and is derived from.

That's a megalo event.

Megalo

A song that people make for their Undertale AUs.

1: "Hey, did you hear that new Megalo?"
2: "Nah, I don't fuck with that AU shit."

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megalo

Literally everything that you'll see when you search for Undertale on Soundcloud.

Damn, I'm really getting sick of all these megalos on Soundcloud.

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Megalo Strike Back

It's not a song not from Undertale but a halloween hack of Earthbound named "I Miss You".

Megalo Strike back isn't from undertale.