To suddenly disappear/appear while you're around some people with you. Or walk off unnoticed by anyone around you.
Johnson: I was sitting with Mary the other night in the station, I looked a second later at her seat and she wasn't there.
Mark: Dude, you just got batman'd!
Angelina: Whoa, man, how did you just appear out of nowhere.
Gay: Hey, I just batman'd you.