What is the south park song from you got f d in A goth kids street scene dance music background not black song?

You're likely thinking of the song that plays in the "Goth Kids" episode of South Park, when the Goth Kids perform their "death metal" dance routine. The song is called "The Death Song" and it's a combination of several different tracks, including:

* "The Death Song" by The Mighty Mighty Bosstones (which is actually just the song's intro riff)

* "B.Y.O.B." by System of a Down (a more aggressive, distorted version of the song's riff)

* "D.A.R.E." by The Mighty Mighty Bosstones

The song is a chaotic, energetic blend of punk and metal riffs, perfectly embodying the Goth Kids' dark and rebellious energy.

While the "Goth Kids" episode features several musical moments, "The Death Song" stands out as the most iconic and memorable.