A form of mental illness. Symptoms include the tendancy to throw a massive tantrum about the smallest of things, a need to have everything his/her way, and an inability to form
friendships with other
human beings.
Never trust someone suffering from Rentapest Syndrome, they will inevitably attempt to stab you
in the back. Fortunately, someone suffering from this illness is also very stupid, and are more likely to kill themselves than anyone else.