A fat, unattractive men who live in their mother's basement playing World of Warcraft. Shadowknives are bound to wheelchairs due to leg fat breaking down their bones. You don't want to be a Shadowknife. Shadowknives cry in real life over video games due to being removed from guilds.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi