Ham stands for: hard as a motherf**ker. Therefore, this word is easily defined as "going hard as a motherf**ker". Every other definition I've seen on this website is definitely not right.
Being so amazing during a moment that the term "going ham" doesn't qualify anymore. And at that moment a can of paint is thrown on the floor around you and you keep being amazing
Person 1: dude are you seeing how good John is in this game of volleyball
Person 2: yeah man, he is going ham in the paint