1)The killing of yourself, and or, the killing of your team mates with intent to get a nerd rage session started.
2) the act of dying in which you take out an enemy in a funny fashion that makes you laugh.
1) Person A: Oh did you see what that guy did?! He killed himself and now were losing, what a scrub!
Person B: Ya, his committing Jokercide.
2) Person A: Omg did you see that he got stuck in the face with a sticky and took out the whole other team!
Person B: Oh god he will have a case of jokercide here shortly.