I learned it at Girl Scout Camp as

I kama zimba, zimba zimba
I kama zimba, zimba zee
I kama zimba, zimba zimba
I kama zimba, zimba zee

Hold him down
(Oh hold him down)
You Zulu Warrior!
Hold him down
(Oh hold him down)
You Zulu Chief - Chief - Chief

Fade chant of "Chief" to dead silence, then scream in unison:
MULLA-GUY!

This last is supposed to be some sort of triumphant war cry, but I am unable to substantiate this, having never actually known any Zulus, warriors or otherwise.