"Underground" is a song by Eminem, released on his album "Relapse: Refill" in 2009. The song represents Eminem's return to the music scene after a hiatus and is known for its dark and controversial lyrics. The song begins with Eminem acknowledging that people have been asking him where he has been in the past few years. He admits that he doesn't know where he has been, but he is back now. The line "I'm underground" refers to his underground status as a rapper who has a loyal fan base but isn't as mainstream as he once was. The lyrics then take a dark turn, with Eminem delving into graphic and provocative themes. He references violence, drug use, and sexual content in a shocking and explicit manner. These lines are meant to shock and provoke a strong reaction from listeners. Throughout the song, Eminem uses wordplay, clever metaphors, and rhymes to deliver his controversial messages. He also plays with different personas, including Slim Shady and references to fictional characters like Jason Vorhees and Freddy Krueger. The song concludes with Eminem sharing a personal anecdote about his own struggle with addiction. He mentions that he is now 90 days clean, suggesting a positive turn in his life. Overall, "Underground" is a song that showcases Eminem's skillful wordplay and ability to push boundaries with his lyrics. It reflects his return to the music scene and addresses his personal struggles while maintaining a provocative and controversial tone.