What is the definition of Fears Macabre?

"A 'fears macabre' is a delightfully morbid sentiment - it's the kind of terror that makes you laugh so hard your belly might as well be a graveyard." Now, here's an example sentence that's sure to unsettle you: "I dreaded the moment I realized my cat had decided to 'fears macabre' over my birthday cake, turning the whole occasion into a macabre masquerade ball."