Synonym for gay. A male who is thought to have mastered the penis.
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.
A shot in mini-golf where you attempt to strike your opponent's ball rather than aim at the hole. The purpose of the shot is to place your opponent in a difficult position while still giving yourself a makeable shot.