Today, it usually refers to one of two groups- the far right political faction in Israel that believe there can be no peace with a two state solution (i.e. no Palestine,) and that it’s their god-given right to murder all palestinians to acheive peace…
Or the christian zionists that support them because their own faith says their god won’t come to save them until they- the jews- rebuild their temple. or something. Fundies get weird.