Hell Or High Water Meaning

(idiomatic) Highly adverse circumstances; acts of God.

Example: 1998, Charles Rosen, Barney Polan's Game: A Novel of the 1951 College Basketball Scandals, page 11
  Even though sportswriters are supposed to be impartial, I'm a Brooklyn boyo and Dodger fan through hell or high water, so my beer is Schaefer.
1999, Aaron Bernstein, Grounded: Frank Lorenzo and the Destruction of Eastern Airlines, page 44
  Bankers call this a hell-or-high-water deal because it protects the buyer from the directors and offers from other bidders.
2002, John Foster West, Time Was, page 230
  Corn had to be hoed three times and plowed five in spite of hell or high water