What diss song was a response to Mobb Deep, featuring the group the Outlawz?
Hell on Earth (Mobb Deep album):  III" and "Hell on Earth (Front Lines)," as well as "Drop a Gem on 'Em," a response to 2Pac's diss track "Hit 'Em Up." Hit 'Em Up: "Hit 'Em Up" is a diss song by rap artist 2Pac featuring his group the Outlawz.
Hit 'Em Up