One who is abusive on large scales; typically
megalomaniacal. A person who is causes the suffering of at least tens of thousands of people in ways that indicate a lack of empathy or personal
responsibility; typically over long periods of time. One who has been corrupted by power. One who's already created more suffering in others than they could
personally experience in a lifetime.
School shooters and
terrorists wish they could match the suffering that Meglabusers create.
Whoever the bank execs were that decided it was okay to give out all the
emergency loans to big rich clients instead of small businesses, those people are Meglabusers.