After the Drake and Beyoncé leak earlier tonight, another huge profile collaboration has just hit the web: Kendrick Lamar and — wait for it – Lady Gaga’s long-rumored 2012 duet meant for good kid, m.A.A.d city, “Party Nauseous” (or “PARTYNAUSEOUS” if you’re nasty) is now here. Stream it below, but to note: Gaga’s on the chorus (“It’s a test / Of your stamina / Do your best”) and adds a spoken-word interlude too (“My name is Lady Gaga,” she intones) while K-Dot handles the verses (“This is for the early coffins of those discriminated / Or racially profiled”). Consider us floored.