Hey y'all. I don't know how many versions of this song there are but I am pretty sure this is close to right for the opening, verse, and the chorus. I don't know the bridge, but this somewhat how the song goes.
[ Tab from: https://www.guitartabs.cc/tabs/s/system_of_a_down/toxicity_tab_ver_3.html ]
I am pretty sure they down tune a half step from Dropped D. But I just play it in D.
Opening ()= Palm mute
E
B
G----7---7---7---7---7---7---10---10---10---10---10---10---------------
D--5---5---5---5---5---5---8----8----8----8----8----8------------------
A
D
E
B
G----7---7---7---8---8---7---7--10--12--12--10--10--8---8
D--5---5---5-------5-------5---8---8---8-------8------8--
A
D
Chorus (4x)
B
G
D--0-------(3)-(2)-(0)-(2)-(0)--------8-7----------------
A--0-------(3)-(2)-(0)-(2)-(0)--------8-7----------------
D--0-------(3)-(2)-(0)-(2)-(0)--------8-7----------------
On the third time they do some weird shit with palm muting that I don't
know. So, sorry. That is most of the song though.