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She says Jeepers
Da-ee
On Quite Interesting Series 6 Episode 8, "Fashion," it was the catch phrase of guest Clive Anderson. According to host Stephen Fry, "Who are you?" was "one of the biggest catch phrases of the 19th century ... it was used in all circumstances, apparently."
One Time
The closest you can get to a Catch Phrase in Harry Potter would be the classic "Bloody Hell"