All of the Am in the chorus have a quick roll downwards following them. It's what makes 
this piece sound really neat. I don't know 
exactly what he's doing, but I but I play 
3 1 0 on the E string and then 3 1 0 on the B quickly while holding the Am chord.

C
Someday you all will perish 
????????????????? Am
in the fire of my hate.

C
Someday you all will drown in
???????????? Am
a sea of my tears.

C
Someday you all will choke on 
????????????????? Am
the length of my hair.

C
Someday you all will smother under
????????????????? Am
the weight of my tits.

F                           G                      
And you will run, you will run 
               C F C F
to the hills.

F                             G                        
And you will run, you will run 
             C F C F
for your lives.

F                           G (held)
And you will die, you will die
             C F C F C F C F
content and happy.