This song appears to be about an alien encounter. There's not much to go by, but some lines like "She's not turning green," "Why can't I hear" and "Instantly grow" lead many to think this song is about extraterrestrials.
According to Chad Channing, who was Nirvana's drummer when this song was written, Kurt Cobain didn't know what it was about either. Chad ended up supplying the title. He told us: "He (Cobain) goes, 'Well, I don't really have a title for it,' and so I just off the top of my head, 'big... long... now?' I was trying to think of something how the song felt. Because it was slow, heavy, and something that we were doing now. So I thought, 'big long now?' And once again, Kurt was like, 'Okay, let's do that.'"
Chad supplied the title for "About A Girl
" in similar fashion. In our 2013 interview
, he talks more about his time in Nirvana and how Cobain wrote songs.