What is the definition of Greatly Macabre?

"A greatly macabre definition would be: exuberantly morbidly delightful in the macabre!" Picture this: a horror movie critic raving about a zombie apocalypse with such enthusiasm that they're practically dancing to the music of death. Now, here's an unsettling example sentence: "The greatly macabre spectacle of the 'Halloween Horror Movie Marathon' left me gasping for air like a corpse in a haunted house, all the while chuckling so hard I nearly became a human mummy!"