To split something (usually a state) apart, on a usually ethnic basis. This verb first appeared in the 1990's during the War in Bosnia, led by Croats, Serbs and Bosnians, which caused the demise of the
Socialist Federal Republic of Yugoslavia (SFRY). It is nowadays again
popular with Kosovar Albanians trying to rip off a part of
Serbia -Kosovo (15% of Serbian territory, imagine the US without Texas)- for themselves.