Thanks to the perfectly wretched Batman tv series from the 60's, Robin had an undeserved reputation for saying "Holy (whatever)" as if his very life depended on it. And this really wasn't fair, because longtime comic readers know that Robin never said anything of the kind. No, as usual, the truth was much worse. There was Snapper Carr from Justice League of America, and there was the Golden Age Sub-Mariner:
That, my friends, was from a single story in All-Winners #11. Frankly, I'm surprised they managed to work in anything other than Namor's fish-centric colloquialisms.
See you tomorrow!