 [biology]
[biology]  A tappen is an obstruction, or indigestible mass, found in the intestines of bears and other animals during hibernation. Also referred to as a `rectal plug.` They make it difficult for the animal to defecate during hibernation, but are often passed with great pain in the spring time. ...
Found on 
http://en.wikipedia.org/wiki/Tappen_(biology)

• (n.) An obstruction, or indigestible mass, found in the intestine of bears and other animals during hibernation.
Found on 
http://thinkexist.com/dictionary/meaning/tappen/
 Tap'pen  noun
Tap'pen  noun  An obstruction, or indigestible mass, found in the intestine of bears and other animals during hibernation. 
Found on 
http://www.encyclo.co.uk/webster/T/11
  No exact match found.