Yeah Yeah Yeahs darling Karen O has teamed up with electro bad girl Peaches and Jackass Johnny Knoxville to produce a track called ‘Backass’. The song will feature on an original soundtrack for the upcoming movie, Jackass 2, along with a track contributed by Wolfmother.

“Peaches and I got together because she was in L.A. at the time and we just whipped out a little tune that makes you want to smash heads,” Karen told Billboard.com. “We got Johnny to sing at the end of it. I don’t know if you’ll hear it in the movie unfortunately, but he’s quite a crooner.”

Jackass 2 is scheduled for release in September.