In the same vein, I'm looking for possible phrases the grandson could use that just weren't around back then and would make people look at him strangely, and vice versa, things everybody in the 50's would have understood that completely baffel him.
Search terms: 1950's slang, 1950's swearing, American slang progression, 1950's TV Tropes, I've looked around on alphadictionary which is really helpful but not quite what I need.