Holy split personality!
The mid-tempo track, "Things Get Worse," harkens back to Em's early days and his button-pushing rhymes.
"Note to Jessica Simpson, let's go with the tuna casserole," Eminem raps in one of the verses. "'Cause I used to love her hooters, now Carmen Electra's cuter/ Strap an extension cord to her arm and electrocute her/ I'm off my f---ing meds but I'm on an electric scooter/ I might just scoot by and shoot my mom in the neck with Rugers/ Spit in Jason's face while I vomit on Freddy Krueger/ They can't even get Jeffrey Dahmer to pet the cougar."
"There's no need to say sh-- you already know, the question is just how far will this go," B.o.B chants on the chorus. "'Cause I will never lay down and I will never let up."
"I guess things are gonna get much worse 'fore they get better," Em chimes in.
The song appeared on the blog of one of B.o.B's managers, but there was no message indicating where the track will wind up or how long ago it was recorded.
After scoring three top 10 hits on the pop charts with his debut album, B.o.B Presents: The Adventures of Bobby Ray, the rapper/singer said he wanted to return to his more lyrical roots before starting his next project.
In December, he released a mixtape, No Genre, that reminded his early supporters of his abilities, which he displays capably on "Things Get Worse."
"I pass by people on the street, they seem like sleeping zombies," he raps. "Stiffer than a therapeutic pair of jeans you running/ So can you hear me coming?/ Eminem, this beat is absolutely disgusting/ It's probably got diseases on it."
It's not the first time the two stars have appeared on the same track, as Eminem also was featured on B.o.B's Grammy-nominated "Airplanes, Part II" remix.
Have you heard Eminem and B.o.B's "Things Get Worse" collaboration? If so, share your opinion in the comments.