Karaokean

Karaokean was the language spoken by the natives of Planet Karaoke.

When Clara Oswald sang karaoke there, the Twelfth Doctor shut off the translation circuits, leaving her unable to understand Karaokean. When she tried to keep singing anyway, she accidentally insulted the planet's monarch, which got herself and the Doctor arrested. (COMIC: The Meddling of Clara's Song)