Similar to going postal & apeshit, this is the fanboy's style for saying it. Named after Darth Vader from Star Wars, who was "legendary" for killing people for the tiniest mistakes or for results that were less than hoped for.
Steve: Oh man, that drive thru bitch forgot your straw.
Jane: I'm going to kill that dumb bitch and her parents, brothers, sisters and her little dog too!
Steve: Going Vader again, dear?