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An adult voyeur who enjoys watching small children undress, without the knowledge of the children or their parents.

Derived from "peeping tom" and a reversal of the acronym "CP," which is internet nomenclature for "child pornography."
If I see that man in the bushes outside the window during the kids' bathtime again, I'm going to call the police and report a peeping christopher.
by Concerned Parents June 24, 2011