If you don't know what it is, here's a perfect explanation:
Originally Posted by Wikipedia
Dubstep is a genre of electronic dance music. Its overall sound has been described as "tightly coiled productions with overwhelming bass lines and reverberant drum patterns, clipped samples, and occasional vocals".
So basically, it's bass up the ass = epicness.
I just fount a stream website too (called Filth Cabin - yeah, it sounds grotesque, but trust me when I say that it's the heaviest DS you'll ever hear).