Lyric discussion by CorrDarklight 

Although it probably does stand for Tibetan Book of the Dead, the first thing that always pops into my head when I read "t.b.d." is "to be decided."

I'm not sure why, but I think that it makes for an interesting interpretation, when combined with the Huxley story and the lines "This is how I'll go out tonight / but I don't need a book." The idea being that the speaker rejects the idea of what is almost ritualistic suicide, instead preferring to let God/fate/whatever decide how his life will end.

yah i was kinda thinking he same thing. maybe its open to interpretation . To Be Determined.

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