a hell of a note meaning

[American slang]
Inf. a surprising or amazing piece of news. (Use caution with hell.)
  So you're just going to leave me like that? Well, that's a hell of a note!
  You forgot what I asked you to bring? That's a hell of a note.

Examples

1. He made his first narrative short film, " A Hell of a Note ", in 1977.
2. "That's a hell of a note, " he said then, " me replacing some of the greatest golfers in the world.
3. "It's a hell of a note that these same people they want to lock in their homes on New Year's Eve were incarcerated for years with no treatment, " said Whitmire.