ATLANTA, GA - JULY 28: Rapper Juvenile performs onstage during "The Legends of Hip-Hop" concert at Wolf Creek Amphitheater on July 28, 2018 in Atlanta, Georgia. (Photo by Paras Griffin/Getty Images) A song that took over ‘99 into 2000’ is getting a revamp in an effort to get people vaccinated.BLK, the largest dating app made for Black singles, partnered with rap legends Juvenile, Mannie Fresh, and Mia X, turning the iconic rap classic "Back That Thang Up" into a new vaccine anthem called "Vax That Thang Up."SIGN UP FOR FOX 26 HOUSTON EMAIL ALERTSThe video is a pro-vaccination campaign encouraging all to get vaccinated before finding a date."Before you find a date, yeah, you gotta wait yeah, you gotta go vaccinate, yeah, in the streets,.