K.O.S

From Rap Dictionary

KOS, short for "Kappin Off Suckas" was a small gang from Spruce Avenue School, linked to the now-defunct Uptown Soldiers. Their rivals were the Northside Boys and anyone from St. Basil School. KOS were known for small time jackings and senseless beatings. They disbanded and its members joined Crazy Dragons, St. Gerard Crew and Crazy Dragon Killaz.