1. Dubstep music featuring a simple background along with several twisting, grinding gear-esque noises. Punctuated by electronic loops and sometimes featuring an irritatingly-high-pitched singer.
2. All Dubstep music.
Dude, I went to the mall for a CD today and this kid was driving around blasting buttstep from his mom's minivan. He didn't even go inside, he just drove around trying to look cool.