Where a group of 6 to 10 women get naked and standing form a line with their legs spread so as to form an upside down 'v'. This creates a tunnel of sorts. The
woman in the back of the line crawls on her hands and knees giving each pussy a lick until she's reached the front of the line. Then the next
woman. In the back of the line does the same and so on and so forth until every
woman has been 'serviced' so to speak.