like which Egyptian?
What I’m picturing is the alternate and much more forceful way of expressing disagreement. Rather than rotating your head back and forth, look forward at all times as you swing your chin toward one shoulder and then the other, like your head is short and rapidly swinging pendulum.
The best I can offer is a few too-short glimpses here and there from this video: http://www.youtube.com/watch?v=yVrNV_5LhNE&feature=related