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A pass time, often performed by German tourists that involves entering a toilet or restroom and filming the interior of the facilities, often with a cell phone or digital camera.

Once the individual returns home, the Karpper will entertain friends and relatives with an evening of recorder water closet videos and voice over commentary outlining the features or points of interest in each lavatory.
"Hans, I have just returned from a holiday in Prague, would you like to come over Saturday evening and watch the results of my Karpping ?"
by Adam_Plausible August 23, 2007
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