J. J. Fad is an American rap group from Rialto, California, whose name initially stood for Just, Jammin', Fresh And Def, and were backed by Clarence "DJ Train" Lars. J. J. Fad gained popularity with the new line-up that included rappers: MC J.B. (Juana Burns), Baby-D (Dania Birks), and Sassy C. (Michelle Franklin). The group were one of the original Ruthless Records acts signed by Eazy-E, and they sold 400,000 copies of their single "Supersonic" independently before Eazy and Jerry Heller had managed to secure a major label recording contract.
Signing the act to Atco Records, both the single "Supersonic" and the album Supersonic went platinum. The album was produced by Dr. Dre and DJ Yella with Arabian Prince, shortly before Dre and Yella gained national fame with N.W.A. J. J. Fad were the first female rap group to earn a Grammy nomination and have a record reach platinum status.