Diaz was born in Tegucigalpa, Honduras but moved with her family to New Orleans, Louisiana. She is of Honduran and Chilean descent Rocsi announced on 106 & Park on July 30, 2009, that she suffered from anorexia during her middle and high school years. She was an avid cheerleader during those years, as well. She graduated from West Jefferson High School in Harvey, Louisiana.She graduated from Nicholls State University.

After growing up in New Orleans, she launched her career in Dallas, Texas, as a host on the city's premier urban radio station, 97.9 The Beat. Here, Rocsi cultivated a unique, street-smart style that caught the attention of Boston's Hot 97.7, where she later became a DJ. In 2004, she moved to Chicago where she was hired as midday-hour DJ at radio station Power 92 WPWX-FM, and was known as "The Midday Mami".