Lines like 'she'll slice you apart' and 'she's the number thirteen' indicate it's about someone Nikki had a strained relationship with - presumably his mother. In one of his books, he talks about her his mother assumed the song was about her, using that as an excuse to ask him for money. He said 'it was - but there's no way I was telling her that.'
It's noteworthy that Nikki considers his childhood to be traumatic, with his father leaving when he was 3 and his mother abandoning him on the porch of their house at age 6, calling his grandparents to pick him up and coming in and out of his life and disrupting it 'as she pleased', in addition to the revolving door of abusive stepfathers. Later, he mentions her calling him during his days in Crue for money, and rights to the music as she claimed she gave him the creative fire to be the person he became.
Nikki had a poor relationship with his mother - recounting in an interview that he didn't feel any sort of guilt about not trying to mend their relationship when she passed.
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