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
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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
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