Microwave Massacre

Microwave Massacre is a 1983 black comedy horror film directed by Wayne Berwick and starring Jackie Vernon in his final feature film role. Considered a trash film by some critics, it has nevertheless grown a cult following over the years.

After coming home drunk one night and getting into an argument with May, Donald loses his temper and bludgeons her to death with a large pepper grinder. He wakes up the next day with a bad hangover, no memory of the night before, and a growling stomach. He discovers Mays corpse in the microwave and after the initial wave of horror passes, he starts to take it in stride, telling his coworkers that he and May separated. After work, he then cuts up Mays body and stores it in foil wrap in the fridge. A running gag involving Mays head retaining some sort of sentience is introduced during this scene.Looking for a midnight snack one night, Donald unintentionally takes a few bites of Mays hand, and again after the initial wave of horror passes, he realizes its the best thing hes ever eaten. He even brings some to work with him and shares it with Phillip and Roosevelt, who concur. He soon starts picking up hookers and using them for meat in his recipes. ........

Source: Wikipedia