"U-Go-Girl" is a song by South Korean recording artist Lee Hyori, featuring rapper Nassun. It was first made available to digital outlets in South Korea a three days prior to the release of her third studio album, It's Hyorish, on July 12, 2008. A dance-pop number with hip hop influences, "U-Go-Girl" was written and produced by songwriting duo E-Tribe, who would later compose Girls' Generation's "Gee" (2009) and Miss A's "Hush" (2013). "U-Go-Girl" was made available via Mnet.com along with the second title track "Hey, Mr. Big" as one of the pre-releases.