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1.
Something extremely difficult/tough or physically rugged and unbreakable.

Can be used to for both physical and mental descriptions.
ex 1:
Dave: Damn, I think I failed that test man, it was cockhard!
Ray: No, you're just stupid.

ex 2:
Dave: My shoulder hurts ever since you body-slammed me on that cockhard floor!
by badkarma927 May 17, 2007
 
2.
to go in big, act wide, spend and die.
Dude, Jeff went cockhard down to Vegas. Haven't seen him for a week.
by HurleyJohnson August 27, 2010