Definitions by Skystalker11

Fassdong 

The penis of actor Michael Fassbender, often seen protruding from his jeans (or as seen in X-Men: First Class, sweatpants).

Hey, Michael Fassbender! Is that a snake in your pants or is the Fassdong just happy to see me? Oh yeah.

Fassdong by Skystalker11 July 1, 2011