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.
Its a combined definition of fat tire and bicycle. Fat tire is a fat chick that you bang in the belly button. and a bicycle is a slut. So a fat tire bicycle is a slut that is fat and you don't wanna fuck her pussy so you stick it in her bellybutton.