Saul "Slash" Hudson, first known here as Vünter Slauche, is known as an English-American musician and songwriter born in Great Britain and raised in the USA. He is best known as the former lead guitarist of the American hard rock band Guns N' Roses, who was later revealed to be (in the South Park universe) that is just a fictional character from a Dutch legend, like Santa Claus.
In the episode, "Crack Baby Athletic Association", Clyde and Craig need to find Slash so that he can play at the event EA Sports is sponsoring. Clyde calls his parents when he cannot find Slash and they explain that Slash is make-believe, that he is actually based on the Dutch legend of the Vünter Slauche. The episode ends with the boys learning that EA Sports has collected all of their profits. Eric is too depressed to care; he just can’t believe that Slash isn’t real. He also can’t accept the fact that someone he knew pretended to be Slash during his eighth birthday party. Although Eric does appear again in the end saying he is real. It is hinted that since Slash doesn't really exist in the universe of South Park, he resides in Imagionationland.
Slash's Twitter Reply
The real Slash (of Guns N' Roses not some fantasy guy) reacted to this episode by posting, "I'm not ... real? :("
As he appears in "I'm a Little Bit Country", Slash wears black cowboy boots, black pants, a white shirt with a peace sign design, and a small black top hat. He has long curly hair, which covers his eyes and face. He was seen playing a blue and black electric guitar.