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Rectum, also known as the poo pipe.
Herbert describers his rectum as the chocolate tunnel, in an attempt to justify why he sticks toys of 10 year old boys in his anus.
by JayReynolds June 26, 2010
The ass hole of a man or a woman.
Dude I gave her some good lovin' deep in the chocolate tunnel.
by mike b jr July 31, 2006