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1.
A Jewish version of the classic board game "Jumanji" in which players must survive the Holocaust as players in Jumanji had to survive the forest.
"Hey Colin, get over here so we can play some Jewmanji!"
by Kyle & Bella October 17, 2005
 
2.
When a Jewish friend begins to start acting bitchy and erratically. Similar to bridezilla but with a Jew.
Blythe: Why is Ilana being such a jewmanji?

Jeanette: I don't know, but that jewmanji is starting to piss me off.
by BlackLuster May 24, 2010