When someone's full of themselves or being a bitch. Similar to asshole or dickhead.
"You hear about Johnny lately? Man, he's such a cockfest."
When someone's dick is so small... that it can only be measured in decimal form.
Male Doctor: "I'm sorry, Rob. But you have a case of Decimal Dick Syndrome. Highly contagious. Please stay away from me."
The loss of permission to use another person's Nintendo Wii console.
When we lost Hick's Wiimote we also lost all of our Wii-vileges.