I haven’t been able to shake the feeling that “crepuscular” is the dirtiest-sounding word I know. Naturally, I love it. It may even edge out “bisextal” as my favorite English word.
You can’t find a definition for bisextal anywhere, it seems. I ran across it once in one of those munificent dictiotomes you find displayed on podiums in most libraries. It means “pertaining to the extra day of a leap year”.
Now that you know this, the obvious course of action is to invite people to your awesome bisextal parties. I can think of similar uses for “crepuscular”, like describing someone’s complexion as such. “What? Oh, it’s a good thing. I mean your face has a warm glow. You know, like crepusculum.”
I think it’s funny, and isn’t that the important thing?