The act of getting high late at night with a group of people and going to a fast food restaurant and parking in the parking lot to eat your food, only to realize that you didn't get enough drinks to satisfy your cottonmouthed needs. Then the driver must have his meal interrupted to go back through the drive-thru to order refills.
When friend A passes out drunk with their mouth open, friend B deposits semen in the open mouth of friend A. Friend A wakes the following morning and notices a cottony-textured subtance in his/her oral cavity.
After a long night of drinking, Fred passed out on the sofa. Russ had the urge to pleasure himself. Upon culminating to a gooey finish, Russ deposited his filth paste in Fred's mouth, giving him The Daytona Cottonmouth.