1. Short for "Roethlisberger-ing"; to have a night of partying/drunken debauchery that would be similar to a night of partying with Ben Roethlisberger.
2. To conduct in an action that is socially reprehensible.
3. To act in a manner that results in a police report filed against you by a woman.
He followed a girl in to the bathroom while his friend blocked the hallway so that no one could follow - he was Bergen last night.