Helluva

Basically “hell of a” but shorter and no spaces.

Helluva bitch.

Helluva Boss

Helluva Boss popular is a animated 16+ TV show made by the American animation production company, VivziePop or SpindleHorse Toons, these are both founded by Vivienne, SpindleHorse Toons has also made the other popular show Hazbin Hotel

Person 1: "Hey! Did you watch the newest episode of Helluva Boss?"

Person 2: "Yeah it was pretty cool!"