Hey Mama! is the debut extended play by Exo-CBX, the first official sub-unit of the South Korean-Chinese boy group Exo. It was released on October 31, 2016 by SM Entertainment under distribution by KT Music. The EP features five tracks in total with a variety of genres.
On October 24, 2016, SM Entertainment announced that Chen, Baekhyun and Xiumin would debut as Exo's first official sub-unit Exo-CBX with an extended play titled Hey Mama!. On October 25, a teaser for the music video of the title track "Hey Mama!" was revealed. On October 27, a highlight medley, featuring previews of the album's tracks, premiered on Apple Music's Beats 1. The album and the title track's music video were released on October 31.
On November 7, 2016, SM Entertainment released the music video for the second single "The One" in their official YouTube account.
The main track is titled "Hey Mama!" ("Mama" referring to an attractive woman) and talks about enjoying parties to make it a special day. The song reached the top of six South Korean real-time music charts shortly after its release, with the other songs following behind. It also reached number one on the iTunes charts in 7 countries, including South Korea, Peru, Singapore, Thailand, the Philippines, Hong Kong and Brunei, as well as number two in Taiwan and Indonesia. "Hey Mama!" was choreographed by Kyle Hanagami, who had previously choreographed for Girls' Generation, After School, Red Velvet, and Black Pink.