It always seemed like it was about writing a song to me. "I'm sitting watching wind blow- watching time go- watching cars go by..." It's like he's crossing out lyrics he doesn't like. In the chorus, he thinks about just screwing the song and throwing his guitar out the window. But I think the theme applies to the song he's trying to write about letting an ex go as well.
It always seemed like it was about writing a song to me. "I'm sitting watching wind blow- watching time go- watching cars go by..." It's like he's crossing out lyrics he doesn't like. In the chorus, he thinks about just screwing the song and throwing his guitar out the window. But I think the theme applies to the song he's trying to write about letting an ex go as well.