Recently, I've discovered that my generation has taken to using "That's bad!" to describe good or otherwise cool things.
"Sweet" was cool, and readily understandable. I was okay with "tight". "Sick" was decent. "Bomb" was annoying. "Bad" is, in no way, a manner in which you describe cool things. I think it's a shorthand way of saying "bad-ass", which leads me to ask... either say "bad-ass", or don't say anything at all.
Ugh... kids these days. xD