Eminem and Royce da 5’9″ aka Bad Meets Evil, have teamed up for a new song, “Caterpillar.” During his verse, Eminem said, “The boom bap is coming back/With an ax to mumble rap,” taking a shot at new school rapper who are about mumbling verses. “Caterpillar” is a song off of Royce da 5’9″’s album,…