On the subject of gankers......here is the breakdown when we talk PvP I think we are taking open ocean in terminology and excluding the organized port battles and such wich you will find most PvE (preferred) players don't mind and participate in. But we all know darn well that there are punks that go out onto the open ocean with malicious intent to wreck peoples day,,,and I believe get off psychologically on it(I suppose its better they do it here than in RL). These are not sportsmanlike people who would be say a group of buddies gone out to hunt troublemakers but the deviants of our game.
So that's me with my interpretation of what I think a lot of us consider to be the definition for that term.