Farming is making posts, usually comments, and either selfvoting or circle jerking just straight up.
Making a one character comment and self voting it is easily defined as abuse.
Doing it 10 times a day will get you flagged, pretty certainly.
Milking is more what some others do, it's not as bad.
We tend to accept milking because those people also show up every day, make coherent posts, and don't engage in other types of abuse.