Boy, those French! They have a different word for everything.

The line is a compact joke built on mock astonishment at linguistic difference. By pretending to discover that French has “a different word for everything,” the speaker humorously restates a basic fact about languages—different languages use different vocabularies—while implying that this is somehow excessive or suspicious. The comedy comes from the faux-naïve, slightly provincial tone (“Boy, those French!”), which satirizes a certain kind of American cultural insularity and the tendency to treat ordinary foreignness as remarkable. It also plays with the idea that translation is harder than expected, because even simple concepts require unfamiliar words.