An erect penis that resembles the hands of a clock at 12:00 P.M. (straight up). If a nooner is exhibited during the late evening hours, it can also be referred to by the term midnighter.
I was sitting at work when Frank sent me that NSFW video. I got a pretty big nooner and couldn't wait to get home and FAP.
by PetefromCrete February 18, 2011
The act of leaving work with someone you are not married to and engaging in a sexual act. Preferably in a car/SUV that you have parked in a parking garage. The location is normally thought to be a secret so that coworkers will not know of the affair. But is normally known to people that park in the garage.
Hey Dennis meet me at my black toyota in the garage, it will be a nooner.
by dag2008 June 24, 2008