Darth Haagen-Dahz was a Humanmale and apprentice of Darth Nihilus. He was created by Nihilus in order to bring him food, and named such because of the Dark Lord's love of Haagen-Dahz ice-cream. Haagen was one of the only beings in the galaxy who knew that Nihilus was actually a dog.
Had too much humor? Who are you kidding? You can never get enough of it! Go check out the Star Wars Fanon Wiki's other article on Darth Haagen where you will find the real definition of Star Wars humor.