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To be attracted to young children, around 7-11 years of age specifically but can be used for any form of Pedophilia
That guy just keeps staring at my daughter. maybe he has Jungle gym fever.

I never told anyone this, but I have Jungle Gym Fever
by PPK September 07, 2006
A person of age who is dating someone who not only is a lot younger, but is underage-- really, really, awkwardly underage. Derived from Jungle fever.
Greg's got jungle-gym fever. Gross.
by Monkepotamus October 10, 2007