Son of a bitch!!!
It's 7 days until HBO releases this as I write this, but if they don't have adult Ralphie exclaim this at some point with the same delivery as young Ralphie then they blew a perfect opportunity for a good laugh.
Since Ralphie was a teenager in the 1940s, I wouldn't be surprised if he said "Fuckin' A!"
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He said the Queen Mother of all Dirty Words once, and he got his mouth washed out with Lifebuoy. I doubt he'd say it as an adult!