An extremely popular synthesized vocal bank, or vocaloid, who is able to artificially sing as directed by a user for musical purposes.
Me: Have you heard the song M@GICAL CURE! LOVE SH0T!
Other person: ...no?
Me: May Hatsune Miku forgive your soul.
Something that, if you genuinely believe a single definition on this website, you need.
Me: Hey where do you get your dictionary definitions?
You; Oh, just urban dictionary
Me: Seek help