What does lady rainicorn say in Korean?

There isn't a specific Korean phrase that Lady Rainicorn says in the show "Adventure Time". While the show features many languages, Lady Rainicorn's language is not explicitly defined as Korean. It's more of a whimsical, fantastical language that's not meant to represent any real-world language.

However, some of her phrases might sound similar to Korean words due to the show's use of sounds and phonetics for comedic effect. But it's important to remember that her language is purely fictional and doesn't have a real-world counterpart.