look up any word, like the eiffel tower:
 
1.
The action of inserting one object inside they other until a three-way is achieved. Can be used in various situations, but usually used in sexual connotations.
John prepared a Turducken for Thanksgiving by sticking a Chicken inside a Duck, and the Duck inside a Turkey. The process in its entirety is considered "Turduckening."
by Turducks December 05, 2010
 
2.
Anal sex that occurs while the receiver is simultaneously excreting feces.
Yo, I heard that Texas has laws against Turduckening.
by OtnememX March 25, 2008