Water walker is the nickname of a fictitious character created by P. F. Hamilton in his " The Void Trilogy ". He. presumably had the ability to walk on water, create fire, telekinesis, concealment and shapeshifting.
Hey! Who the fuck do you think you are ? The water walker ?
One who thinks his shit doesn't stink and is unyielding to bend the rules. An idealist who believes he's been bestowed divine right and believes he can "walk on water", literally. One who takes it upon himself to enforce any and all rules with extreme prejudice. A hardass.