What is BM on ranked ladder?

Let's say you want to climb the ladder at any cost. What all is acceptable on RM online games? What is BM? What isn't BM?

EXAMPLES:-

Laming boar

Laming sheep

Laming res by walling

TC DROP

Picking civ

Killing deer

Killing sheep

Not resigning and hiding vills

I generally don't do any of these, but I play for fun. But think all these are considered BM.