who sings when you back that thing up
Back That Thang Up "Back That Thang Up" (or the uncensored version "Back That Azz Up") is a song recorded by American hip-hop artist Juvenile. It was released on February 24, 1999 as the second single from his 1998 album 400 Degreez. The song was Juvenile's biggest hit single until the release of "Slow Motion" in 2004, peaking at number 19 on the Billboard Hot 100.