Dear Demelza,
In many Arab countries, the slang is "Zubber" or "Zub", but it could be Zubra in Egyptian dialects. Sort of rhymes with Super (almost) and the Arabs around here got a big kick out of saying they were going to go see the movie, Zubber Man!! And they wanted their fries Zubber Sized, and other such funny stuff.
Regards,
A'isha