Human centipenis 

When males partake in polygamous anal sex facing in the same direction, i.e. nut to butt, so that the orgy resembles a centipede. Although only a true centipenis can be made with exactly 50 participants, any group of 3 or more is commonly refers to as this for comedic purposes.

"Did you see the MMMM scene in that new pornographic video, 'The Human Centipenis'?"

"Yes sir, I thought Scotty Aces' middle performance was worthy of an AVM."

Human centipenis by Scoops747 July 30, 2013

Human Centipeding 

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.

It was good, until the other three people started human centipeding all over the place.

Human Centipeding by thisistotallynotmyname May 19, 2011

human centipeding 

Farting directly onto someone’s face with your asshole adjacent to their mouth hole

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!!!

human centipeding by Schtuff April 2, 2018

Human Centipeding 

When your main bitch bails on you before a date when they agreed to do your makeup, sealing your fate like the surgeon in this popular film sealed one mouth to one rectum.

Brethany: hey r u on ur way? ;)
Anicunt: gurrrrrrl, I cant make it beeeech. Y’all gotta do yo own make up 2nite
Brethany: (to herself) damn that bitch is human centipeding me :(

Human Centipeding by happyanus July 9, 2018