Lyric discussion by djtablecloth 

Cover art for Siamese Fever lyrics by Dog Fashion Disco

I think the Siamese twin is actually more of a metaphor for your torn conscious, the classic 'devil & angel' sitting on your shoulder. The devil loves you - so does jesus christ (the decision you have to make, you can't have both.) I don't know if there was a particular decision in mind when writing this, but it can be applied to anyone in that situation. Also, scissor homicide - would be suicide, I think is the fact that no matter how much you'd like to pick one and kill the other, you can't, the conscience remains.