*EDIT* I remembered that the 2nd half of the chorus is someone saying something along the lines of "I'ma have to pop you, i'ma have to pop you." or drop. Please help! :P
This has been driving me nuts, and I can't seem to find it.
During the chorus of the song, there is a somewhat high-pitched voice that comes in and says, "I'm the ***** *****, the *****, the ***** *****, the ***** that you love to hateee.." Which is then followed by a deeper voice who comes in and chants another line.