The definition of AMOG is: Alpha Male Other Guy
This means another alpha guy who is a real competition to you. It doesn’t matter if he is already part of the group or trying to seduce the same girl like you. The difference to a cockblock is that he has real game and it’s not so easy to get rid of him. The best way to handle this is to use AMOG Destroyer Techniques, this way your “amoging” and the better one wins.