Do a couple tracks of you saying the chant, a couple of you yelling he chant, and a couple of you whispering the chant. That would probably work. That's the kind of technique used to get that "We are the youth gone wild!" kind of sound. If you want a more true-to-form sound (as in, sounds more like the movie's chant) try setting up a stereo pair of cond. mics, then dub the part over and over and over, you'll probably need about 10 takes of it, then if need be, copy those takes but change the levels. The more takes you do, the closer it will sound (remember the chant is many men doing, so try to replicate that).
You could try to just do a couple of takes of it and then copy them a bunch and pan them differently, but I have a feeling you'll be happier with the results if you just do more takes (it'll sound more realistic).
Good luck.
