douchecepticon 

When someone is a Megatron sized douche.

That dude is a douchecepticon.

douchecepticon by projectmeltamouse January 20, 2011

Douchepticon 

1. A person who appears to be normal at first but exposes themselves as a douchebag later.
2. Douche in disguise

Everyone looked cool when we first got here, but there just a bunch of Douchepticons!!!

Douchepticon by Brophessional December 29, 2009