This term is used to (re)define "
Kansas City", using the initials "K.C.". In the Fat Tone song (the Killa City rapper murdered in a deadly, 2-way dispute with rival Vallejo, CA. rappers) he says "...he started calling..." "Kansas City": "Killa City", due to so many of those he knows being "
knocked off". If this is merely a use of flamboyance, or a literal, and legitimate claim by Fat Tone, this author may not say. The use of an "a" on the end of "Killa" is a typical, trademark spelling, and
pronunciation often employed by urban individuals, especially in rap culture... Eg. Nigga, Brotha, etc.