Persian cat is so satisfied with her meal that she literally howls in delight
It is no secret that Oskar could snack every few minutes if there is food around, so her human has to watch her portions. After almost every meal, when no one is around, she makes this hilarious howling sound to let her human know that she's done eating and that it was delicious. Who knows, maybe she'll get dessert if she is loud enough!
... and disable advertisements! No kidding :)