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1. Also known as the Castor Gras. Appending fur (like that of a dog or other household pet) to the condom with an adhesive before commencing any sexual act involving penetration.

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I wanted to try something new last night with Tina, so I shaved my dog and glued the fur to my condom. This is known as a 'fat beaver', in memory of George Colpitts.
by The King of Old Broadway December 20, 2008
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