Track Description Available in: "Fat Lip" is a song by Canadian punk rock band Sum 41. It was released in April 2001 as the lead single from their 2001 album All Killer No Filler. It is the band's most successful single to date, topping the Billboard Modern Rock Tracks chart. It peaked at number 66 on the Billboard Hot 100 chart and at number 8 on the UK Singles Chart. The song was performed on Saturday Night Live on October 6, 2001, hosted by Seann William Scott.