In Europa Universalis II, turboannexation means "annexing" a country via its government collapsing. It is not a true annexation: not all provinces can be taken. However, when an enemy government collapses, a belligerent country can take any number of its provinces, minus its capital and usually one other province. Generally, turboannexation is a planned result, but not always. By contrast, turboannexation is very fast. It requires one well-planned war, plus one or two easy "mop up" wars against the rump state that is left after a turboannex.