What are they chanting?

[Heather Maffioli]

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In the "snapes worst memory" scene  while he is suspended upside down what
are the other students chanting in the background?  There is a reviewer, the
movie mom from Yahoo, whom I believe thinks they are chanting "sissy".  To
me it sounded like "Princy" which would be quite the spoiler for the next
film. 

Heather
(Who is just finding more and more reasons to see it yet again)