When a man receives oral pleasure by standing over the participant and "dips" his genitalia and/or genitals into said participant's mouth. This action must be performed within the limits of a parking lot in order to constitute valid "parking lot dippin."
Parking lot dippin' is my preferred method of oral sex. The trajectory allows me to better discharge my semen directly to the back of the woman's esophagus. If properly executed, the skank will choke violently.