The general intention is that the opponent feels mocked, and due to the nature of the game's turns, is powerless to respond or prevent the player from taking whatever actions they wish.
As well as being used to gloat or intimidate the opponent, BM can also be used by losing players to aggravate the victor, and even to encourage them to concede the game.
Because the use of mobile and online communications has grown so rapidly and the crime is relatively new, many jurisdictions are deliberating over cyberbullying laws.
However, the crime is covered by existing laws against personal threats and harassment.
Cyberbullying is often done by children, who have increasingly early access to these technologies.
The problem is compounded by the fact that a bully can hide behind a pseudonymous user name, disguising his or her true identity.
Bad manners, commonly abbreviated to BM, is a term used to describe intentionally obnoxious behaviour within Hearthstone.