True mastery of the cock requires regular practice.
Cockmastery can NOT be achieved by masturbating as this only results in the mastery of ONE cock (ones own), not cocks in general.
Therefore a cockmaster is a male who is thought to handle other peoples penises frequently, thereby aquiring skills that have to be considered masterful.
"Piss off, cockmaster."
Homo sexual example: Stop acting like such a cock master, we just got here.
Profanity example: Holy cock master, I just pissed myself.