Does anyone know what “De Le Mio Myo” means??

Someone texted from an unknown number to me and said β€œDe Le Mio Myo” and then sent a voice mail that said it with static and a deep scary voice.I still dont know who it was but it happened on Christmas Eve.My friends said it might be a prank but i dont know and im really scared. If anyone knows who it is please tell me.Also this is not fake I promise.I just dont know where to post it.