Lyric discussion by JackLecter 

There's obviously a lot of relationship stuff here, and I think, if there's anything to this it probably fits into this context, but here goes:

The title of the song puzzled me. In the lyrics, the references to "three parts me" reflect an inequality in the relationship, okay. But to make that the title of the song seems to give too much emphasis to a strange metaphor. Furthermore, the song is not titled "3 out of 4", or "3/4", but "Negative 3" which is not the same thing, mathematically, and I don't think it's like Manson to be so sloppy.

I don't claim to understand it exactly, but it occurred to me that numerology and particularly the number 3 come up a lot in Manson's other work, particularly Antichrist Superstar.

From what I've read of numerology, 3 related to perfection or transcendence, to god (or at any rate, divinity), so Negative 3 might be a sort of Negative God, or Antichrist. Manson also has a song called "The Reflecting God"; a reflection seems to me to be analogous to a negative, numerically, and this becomes even more tangible when we apply the concept to a photo negative. (This may be random, but the lyrics do mention "your high school picture", so photos may have been in his thoughts when he wrote this.) And of course, "The Reflecting God" is off "Antichrist Superstar".

Finally, from my limited research into numerology, the number four represents humanity, earth, imperfection.

In this song's lyrics, "it's one part you, three parts me," which suggests divinity (me) being tempered or corrupted into humanity, the transition of three (a divine state) to four (a flawed, human state. This would fit the "destructive relationship" theme. The overall vibe given by the song is that he is abusing her, but it sort of seems like he feels she's a corrupting influence, as well. This would fit with his relationship with Nancy (which he discusses in his autobiography), although I don't know if this is about her specifically.

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