"My Girlfriend" is a song by the Christian rock band Relient K, released on their self-titled first album. The song originally appeared as "Marilyn Manson Ate My Girlfriend" on the band's demo album, All Work and No Play. The song is about Marilyn Manson eating Matt Thiessen's girlfriend. Thiessen wrote this song when he was 15 years old. Thiessen has said that he wrote it because of a female friend, who lived eight hours away in Pennsylvania, who he would talk to about many things including spiritual matters such as where God was taking them in the future. His friend would later turn from Christian music to Nine Inch Nails and Marilyn Manson. In an interview with CCM Magazine Thiessen stated "through this she changed her lifestyle [and] what she believed in." His friend would later be exp