GDK is an acronym standing for 'Gangster Disciples Killer.' This term is prominently used by gang members to signal their intent to harm or eliminate members of the Gangster Disciples (GD) gang. While any rival gang can adopt this term, it is predominantly associated with the Black Disciples, a primary adversary of the GDs. Other similar terms include 'BDK' and 'EBK.' Gang members often append a 'K' to their rivals' gang names to signify their lethal intentions.
The term GDK has surged in popularity recently, largely fueled by the emergence of drill and trap music from Chicago. Many rap artists affiliated with gangs have incorporated it into their lyrics. For instance, Ballout, a member of the rap collective Glory Boyz Entertainment (GBE) and an affiliate of the Black Disciples, references GDK in his track "My Set." In the song, he emphasizes, "We BD, GDK on my f*cking set - Lil n*ggas everywhere and they holdin Techs."