A song from the fucking hilarious musical "Avenue Q". It's also a German word meaning happiness at the misfortune of others.
Nicky: Hmm...Schadenfruede, huh? What is that? Some kind of Nazi word?
Gary: Yep! It's German for "happiness at the misfortune of others"!
Nicky: Happiness at the misfortune of others...that is German!
Kyle: What is this feeling when you watch a Vegetarian eat chicken or a Frat boy realize just what he put his dick in?