This song is punk. Current American Idol judge Jim Jonsin's bass owes its dark slide to stoned riffers like Noothgrush and that Whoaaa ooh chorus is pure Misfits "Hatebreeders". While clearly that is conjecture, it's a pretty picture to paint of Yelawolf's box Chevy bumping dark mixtapes. As for B.O.B., maybe Haley Williams put him onto it.
Download: Yelawolf f. B.O.B., "It's a Party"