a clever title to AC/DC's latest album. its referring to the quote "when hell freezes over". if hell was to freeze over, that's what it would look like; black ice. Angus and Mal are known for using innuendos in their lyrics
bro 1: hey did you hear? AC/DC's gona come out with a new album!
bro 2: AC/DC!? yeah right, that'll happen the day hell freezes over
there for AC/DC titles the album Black Ice because it was thought unlikely that they were going to make another one. clever