After impressing viewers with his BET Hip-Hop Awards cypher, Machine Gun Kelly fires off more music from his upcoming RagePack mixtape. On “STFU (Shut the Fuck Up),” the Bad Boy signee rages over a sample of The Go-Go’s “We Got the Beat,” lashing out at fake fans, groupies, and online haters. “Only person even worthy of dissing me on the come up is my damn self,” he proclaims. You heard the man.