Filthy (or dirty) is a word used to describe modern dubstep that is wild, heavy, and over the top. Most dubstep listeners consider it a compliment to a song, though song prefer more controlled and on the hook songs.
That drop was filthy!

Dude, got any filthy dubstep?
by CromBomb June 22, 2016
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Its what a robotic males sperm would sound like traveling from his robotic penis into the robotic female and meeting a robotic egg.
That dubstep was filthier that katie prices cunt. god i love Filthy Dubstep.
by ladofknowle March 4, 2011
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