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1.
The insertion of a connecting pipe between two peoples anus's (preferably a clear pipe) and the passing of turds back and forth for sexual gratification.
Do you fancy something different tonight darling? On urban dictionary I found something called Chunneling
by Lee Bullock- MulletHunter September 10, 2003
 
2.
To Chunnel, Chunneling is the sexual practice of defecating inside a toilet roll, then inserting that toilet roll into a person, and having sex with that toilet roll whilst it's inside them.

It is commonly used around Maidstone and other areas in Kent in particular, and is named after the Channel Tunnel, because the act of chunneling looks a bit like a car going into the Channel Tunnel.
He deserves a good chunneling for that.
by eggsbag October 07, 2012
 
3.
Two gay guys connect their asses together with a plastic tube. Then one guy takes a shit and lets it glide to the other person. They do this for a while.
Ultimeas likes chunneling with his dad. That is when hes not busy being teh Dancing Queen.
by DragonHunter February 16, 2004
 
4.
when one removes a used condom from a "lover's" orifice using only their nose, tongue, teeth, and lips.

A chunnel master is one who successfully removes the condom without spilling anything.
Although, at first the man was opposed to chunneling, he soon found himself a chunnel master.
by peter palmer March 20, 2006
 
5.
chunneling but with piss.One guy takes a piss in a tube or cum whatever floats your boat and pass it back inforth.
chunneling is knew to CP
by Tyler May 05, 2004