What does Batman Effect mean?

Batman Effect meaning in Urban Dictionary

An either voluntary or involuntary (usually involuntary) impact that a person might have when walking around a group of buddies. Individuals do not usually observe people with the batman result if they walk up because they're peaceful and do not state something when they do this, also, it often scares the person/people that the person is walking as much as. Much like the DC comics superhero, Batman, for this reason the name "Batman Effect"