"Birthday Song" is a song by American rapper 2 Chainz, released July 24, 2012 as the second single from his debut studio album Based on a T.R.U. Story (2012). The song, which features fellow American rapper Kanye West, was produced by Sonny Digital, West and BWheezy, with additional production by Anthony Kilhoffer, Lifted and Mike Dean. The hip hop song is about the rapper's yearning for women with large buttocks.