“Exiled” stars happen when a multiple star system gets too close to a black hole. When one of the stars gets sucked into the black hole, the gravitational pull on the other star(s) becomes so great that when the connection between the stars is finally severed from falling into the hole, it acts like a cosmic slingshot.
The other star or stars are catapulted away from the black hole…at such a velocity that they can escape the galaxy.
Those stars will wander in space until they eventually burn out.
Exiled Stardust 