Dallas Car Wash
A sexual act that involves a minimum of four people (3 men and 1 girl). A girl crawls on her hands and knees inbetween the legs of three or more standing men. The three men proceed to jack off over her and ejaculate all over the girl who is simultaneously crawling between the 3 guys' legs.
Because Jen was a dirty girl, Frank, John, and Bill all gave her a Dallas Car Wash