an individual, normally on meth or coke, who insist that there are policemen, ninjas, wizards, or some other type of threat outside the window of their home, resulting in a constant peep through the curtains or blinds of their windown with the best view of the street and drive.
Across the street, I notice that there is an apartment inhabited with peeper tweakers, because i constantly see creepy tweakers peeping through the blinds.