If the words “Damn, son, where’d you find this?” set off your brain’s Pavlovian pleasure centers, the first full-length collaboration between the influential Chicago rapper and the Atlanta superproducer will take you back to the era when rap tapes fell from the sky, hastily compiled and laden with gratuitous DJ drops. The wily energy and plentiful “REAL TRAP SHIT” cues on Dirty Nachos harken back to the early 2010s, back when both Chief Keef and Mike WiLL were emerging as bold new stylists in a saturated trap landscape. Today the two veterans have earned their icon status, which frees them up to keep it wild and loose across the album’s 18 tracks. Blustering beats abound, as do Sosa’s often imitated, never duplicated lyrical obscurities. (“I told my daughter stop breaking off her Barbie heads!” he crows on “Harley Quinn”.) It’s an insular affair but for two well-chosen guest spots: 2 Chainz on “PULL UP GHOST-CLAN”, and on “DAMN SHORTY”, Sexyy Red, a Keef scholar in her own right.