I think this song is about someone whose lover (wife, girlfriend?) has left them for someone else, and they fantasize about surprising the new and happy couple in their bed, stabbing them and setting the bed on fire -- not so much out of desire to cover evidence, but out of sheer outrage and a maniacal desire to destroy all there is about the couple. I think the rather bizarre line about licking the dagger might have possibly come up mainly for rhyming purposes, but was used because it keeps an image of someone who has completely lost their mind doing bizarre things in rage.
It is also possible the man is considering setting his own bed that he shared with his lost girl aflame and then killing himself with a dagger.
I think this song is about someone whose lover (wife, girlfriend?) has left them for someone else, and they fantasize about surprising the new and happy couple in their bed, stabbing them and setting the bed on fire -- not so much out of desire to cover evidence, but out of sheer outrage and a maniacal desire to destroy all there is about the couple. I think the rather bizarre line about licking the dagger might have possibly come up mainly for rhyming purposes, but was used because it keeps an image of someone who has completely lost their mind doing bizarre things in rage. It is also possible the man is considering setting his own bed that he shared with his lost girl aflame and then killing himself with a dagger.