Definition - What does Nooner mean?
Nooner is a slang term that refers to a timely sexual encounter that occurs mid-day or on a lunch break.
Kinkly explains Nooner
A nooner can refer to a quickie that occurs on a lunch break, or another break, in the mid-day. Nooner does not specifically refer to sexual intercourse, but does specify brevity. A nooner is a brief sexual affair.