GDK stands for Gangster Disciple Killer anyone who's GDK hate GD's and are against them for example rappers Pop Smoke and Fivio Foreign are GDK since they beef with GD's in Brooklyn, New York.
Fivio: Fuck all GD's nigga we big GDK
Pop smoke: Yea fuck the GD's talking about
by Suvacious November 1, 2020
“Ayo bro you GD? Na brodie you know I’m big GDK”.
by May 31, 2021
GDK is an acronym meaning 'Gangster Disciples Killer'. This acronym is used by gang members to make aware of their intension to kill Gangster Disciples gang members. Any gang whom are enemies of the GDs can use the term, though it's mostly used by Black Disciples gang members, since they are one of the main rivals of the Gangster Disciples. There many other terms similar to GDK such as 'BDK' and 'EBK'. Gang members are known for adding a 'K' at the end of their rivals gang's name to mean they will kill them any chance they get.

GDK has gained popularity lately due to the rise of drill and trap music from Chicago. Many rap artists who gang members have been using this word in their songs. Ballout, a member of the rap group 'Glory Boyz Entertainment(GBE)' and members of the Black Disciples gang, used it in one of his song titled "My Set", in which he says "We BD, GDK on my f*cking set - Lil n*ggas everywhere and they holdin Techs".
Them dudes over at south side claming they GDK
by Bro Im too Smart June 1, 2022
Yo i just say two GDK’s
by Mr_Lost February 15, 2022
GDK: German Doner kebab the best kebab shop in Southampton, England nothing beats a GDK especially when your on it.
Person 1: Yo I've got the munchies

Person 2: Ire let's go GDK

Person 1: Come den
by XXXRIP February 8, 2020