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1. A magical creature that leaves semen in unexpected places.
2. A common excuse given to explain why there is cum on your sheets when you can't remember how it got there.
3. An alternative to whorish behavior.
Her roommate accused her of having sex in her bed, but she claimed it was the work of the semen fairy.
by MyPlaceIsInTheKitchenGirl November 03, 2005
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