Underground (indie) music that appeals to a discerning, educated audience keen on cynicism and dejected wit. The music itself is often mellow yet complex- a reflection of its audience's personality.
Smart rock is the antonym of Dude rock.
Instead of studying their AP English Literature homework, William and Sara made out to Smart rock on the couch.
Rock music with high-brow lyrics. Usually alternative-sounding, and bizarre to people who don't get the references (often political, philosophical, scientific, or to other smart rock).