The act of three people engaged in the act of eating the butthole of the person in front of them. The person in front is known as position 1, with the numbers increasing down the line. More than three people is possible, but is strong discouraged.
Troy fell asleep on the bench, so Wade woke him up by straddling his face and human centipeding him so that he would hear, smell and taste the nastiness. That was one fart he’ll never forget!!!