There were two known bands using this name: 1.) Excretion was melodic death metal band from Salem, Sweden who were active from 1991 to 1996. They released three demo tapes and one album on Wrong Again Records. Last known line-up:
Thomas Wahlström - Vocals, bass
Anders Hanser - Guitars
Christoffer Holm - Guitars
Tommy Ottemark - Drums 2.) Excretion was a folk punk band formed in 2006 in Arlington, Texas. The lineup consisted of Benny, Owen, Nik, and sometimes Zak.

Read more about Excretion on Last.fm.