1. Portmanteau of "brutal" and "beautiful".
2. When something is so sardonically beautiful and/or has a dark or morbid appeal meshed with sheer "purdiness", tact and/or skillfulness it can only be described thusly.
ex.1: dude...that song "Mordecai" by Between The Buried and Me is so breautiful...but I think the same about "Selkies: The Endless Obsession" and hell, all of their stuff is breautiful so I can't choose a favorite song of theirs.
ex.2: "Have you seen any of the Saw movies?"
"Yeah, I love them! The philosophy and motivation of Jigsaw and his puzzles...its so breautiful."
ex.3: I'd have to say my favorite classic expressonist painting of all time would be Edvard Munch's "The Scream" ...its extremely breautiful.