The song "The Letter" by Hayes Carll is about a man who is living a wild life and meeting all kinds of people along the way. He sings about how some of the people he meets are fake, while others are genuine. He also talks about the dangerous situations he finds himself in, such as speeding down the highway "like a bullet from a gun." The man in the song receives a letter from a woman named Birdy who is urging him to come home, but he's not sure if he's ready to leave his wild lifestyle behind. He acknowledges that he's wasting his days and burning through his nights, but he's not sure how he got to this point or how to change. Despite his love for his risky lifestyle, the man in the song also thinks about the woman who sent him the letter, hoping she's okay and dreaming of being with her again. Overall, the song is about the temptations and dangers of living a wild and reckless life, and the struggle to balance it with the people and relationships that are important in our lives.