(chiefly US, informal) A sexualencounter during lunch hour, especially one which is illicit.
1998 Dec. 11, Benjamin Lee, Daily Collegian (University Wire), State College Pennsylvania:A simple recess for lunch can turn into a nooner—a midday sexual encounter.
2006 Sep. 22, "Funnyman Dennis Miller Returns to FNC!," FOX News:If you're going to knock off a nooner with a co-worker at a bad motel you have to scrawl your worn Hancock on the desk blotter.
