drill music. The term is coined from two words, the slang term ‘drill’ and the state of ‘Illinois’. Drill is a slang word which means to kill, shoot, etc. while Illinois is the state Chicago is in. At the time this term was created, Chicago was one of the murder capitals of the United States, so rappers, in an effort to illustrate their murderous city coined the term ‘Drillinois’.
Rapper King Louie has a mixtape titled “Chiraq Drillinois” and also has a song with the same title. Rap group 485 has a song titled ‘Chiraq’ in which they make numerous reference to the term drillinois.