nooner in English dictionary nooner Meanings and definitions of "nooner" (chiefly US, informal) A sexual encounter during lunch hour, especially one which is illicit. noun (chiefly US, informal) A sexual encounter during lunch hour, especially one which is illicit. more Grammar and declension of nooner nooner ( plural nooners) nooner (plural nooners) more Sample sentences with "nooner" Declension Stem Try again Available translations German Authors