Bob Dylan explained "standing" (or so says Chief Justice Roberts)

“Bob Dylan captured the whole notion behind standing,” Roberts said. “In that case, the party didn’t have anything at stake in the case and had nothing to lose, and the case should have been thrown out on that basis.”

Article here (via ABA Journal). 

Standing is the legal concept that in order to appear in a law suit, the parties have to have some skin in the game. If you're mad because a law was enacted, but the law doesn't effect you, then you have no standing, and can't sue to "test" the law.