So, the meaning of words can change between generations. For example, when Mr. Burns says he had a lot of "gay" times when he was young, he may not take this expression to mean the same thing as Mr. Smithers.
Here is a visual example of this phenomenon. Zelda is trying to educate Dobie Gillis. He's too dumb to remember the way home, so she comes up with a clever way to help him remember. I think you'll find this easy to remember as well: