A group of extremists who have broken from the state, somtimes the military, to form there own paramilitary organisation. They use terrorism/guerilla warfare to fight for thier cause
I.R.A has lots of splinter groups, and there are lots of communist/marxist splinter groups as well.
by Austin November 9, 2003
A group of stag party participants who sneakily break away from the main group because they're too boring
This pub is shit, let form a splinter group and go to that lap dancing club around the corner
by The C-Dawg June 8, 2010