Filthy pop is like a combination of dissonant eclectic music and the simple, pop. It's mainly underground music that you would not expect to hear on the radio.
Filthy pop would be anything you could think of that has the qualities to be pop and at the same time, could also be labled as "weird".
Much of the music in this genre contains samples of industrial music and isolationism. It could also be described as somewhat electroacoustic or "space music"
Popol Vuh, Cluster, Tangerine Dream, World's End Girlfriend, Richard Bone, Radiohead, Nine Inch Nails, Enigma, and Coil are all examples of bands that include filthy pop as one of their stylistic components.
Some movies that have filthy pop songs listed in their soundtracks are A Clockwork Orange, The Elephant Man, Requiem For A Dream, Donnie Darko, Lost in Translation, Zodiac and The Social Network.