All of us? Every single one of us?? The expression is, "have supper". As in "let's have supper before we go to bed".

Supper is still a popular word that means the same as "dinner" in some areas. I've always thought of it as "a southern thing" because people who called themselves "country" always used the word "supper" instead of "dinner".

It's the same as: let's have breakfast/lunch/dinner

Really? This is news to me. It's quite commonly used (but it is "have supper", not "have a supper").

Supper is a confusing word. For some, it is a synonym for 'dinner', while others it is a meal after dinner. In fact, there's a whole Wikipedia article (http://en.wikipedia.org/wiki/Supper) on the topic.