Definitions by m. w.

cock block

To prevent one using one's cock in the manner that one desires.

Neutering Antoine, the cute cute cat, was the ULTIMATE cock block.

cock block by m. w. November 24, 2006

gaycud 

(you should be able to figure out the definition based on the context of the example below).

"tony is a gaycud".

gaycud by m. w. May 9, 2005