A type of fan fiction that explores a sexual or romantic relationship between two characters (usually male) that are not romantically involved in the source material. The name comes from the slash (/) that typically separates the two characters' names in the story's title or description. Dean and Castiel are my favorite characters on "Supernatural," so yeah, I've read Destiel slash fic.
See also: slash
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.