Whenever a topline MC has a track in need of a guest-spot adrenaline shot, he asks Siri to summon Waka Flocka, who swoops in like a caffeinated Batman and unleashes his shout-first-ask-questions-later squall. The Queens-born, Atlanta-bred ”No Hands” rapper’s guttural lung-busting is ideal for cameos, but those same traits make for an exhausting album-length presence. Several tracks in, his second disc begins to bow under the weight of its own aggro intensity. That leaves his own bevy of A-list guests — including Nicki Minaj, Drake, and an especially elastic Ludacris — to bring some fresh jujitsu to Waka’s flailing fight game, and provide occasional respite from Triple F Life‘s single-minded mania. B?