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Inspired by the Dirty Sanchez, the Dirty Potter consists of the sticking your index finger inside your partner's rectum and then, upon retraction, smearing a humble lightning bolt on their forehead.
"I took my girlfriend to see that new Harry Potter film, where she became aroused to the idea of me performing the Dirty Potter on her later...which I did!"
by i'veabandonedmymilshake! July 15, 2009
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