Definition of knap sack
knap sack 
noun
- testicles.
He got a swift kick in the knap sack.
Submitted by Robert Linville (DJ Nimbus, Ann Arbor, MI, USA, Jun 08 2007.
Discover slang words with the same meaning:
Interact:
Linking
To link to this term in a web page, blog, or MySpace page, insert
<a href="http://onlineslangdictionary.com/definition+of/knap+sack">knap sack</a>
To link to this term in a wiki such as Wikipedia, insert
[http://onlineslangdictionary.com/definition+of/knap+sack knap sack]
Some wikis use a different format for links, so if you're not sure, check the documentation.