A man who was born a genius, but since no one could compete with his brains went insane out of boredom and started killing people. Then he met Batman, and found someone who actually understood him, who <i>completed</i> him and <i>didn't laugh at any of his jokes</i>. So now he tries to screw Batman's life up, because Batman's just too much damn fun.
A female celebrity with a huge grotesque grin. Coined by radio DJ's Don and Mike to describe Cameron Diaz.
A reference to the poisoned products that The Joker unleashed on Gotham City in the movie "Batman" which killed their victims and left them with horrific grins on their faces.
When going down on a chick, you notice the tampon string, you clench it with your teeth and vigorously shake the bloody tampon back and forth, leaving bloody marks from ear to ear. After spitting the tampon out, you look her deep in the eyes while saying, "Why so serious?"