Ma Boy (SISTAR19 single)

"Ma Boy" is a song by South Korean girl group Sistar's sub-unit SISTAR19. It was released to radio and online as a digital single only on May 3, 2011 through Starship Entertainment.

Release
In April 28, 2011, it was announced the creation of the sub-unit SISTAR19. The new group, which features Sistar's main vocalist Hyorin and rapper Bora, debuted on May 3. The '19' in their name represents the age that girls mature into women and it also embodies the sense of innocence yet uncertainty they feel. They aim to showcase these feelings through their lyrics and concepts.

Sistar19 released the teaser for their single "Ma Boy" on April 28, 2011. The single was released on digital music sites on May 3, 2011. The official music video was unveiled on the same day.

On May 12, 2011 Sistar19 released a rehearsal video for their track, “Ma Boy”. The song was written and produced by Brave Brothers.

A special version of "Ma Boy" was later included on Sistar's first full album "So Cool" which, in addition to the regular members of SISTAR19, included vocals from the two other SISTAR group members, Soyou and Dasom.