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1.
To Stab someone with your Penis.
This is one of the most severe forms of ownage and if it happens to you, you should be ashamed

Comes from the words Cock - meaning penis and the
word shank - meaning stabbed with a sharp object
My mate got cockshanked the other day, poor bugger got owned
by SpecialOps October 18, 2006

Words related to cockshank

cockshanks dickshank ownage penisshank shankage
 
2.
General offensive term - usually placed in a lengthy insult-string for a bit of variance.

First penned by fff aka maunderswan. And don't you forget it.
A: 'yoyoyo'
B: 'hush now, cockshank'
by ~swan June 22, 2005