Dwight Poorman, of Far Rockaway was arrested for public lewdness after a Monday morning incident.
At 9:15 a.m. on Aug. 19, Poorman, 61, allegedly exposed himself on a MTA bus riding near Rockaway Turnpike and Rugby Road in Cedarhurst, Nassau police said.
The three alleged victims, a 30-year-old man, 17-year-old girl and 7-year-old girl we're witness to Poorman's actions, after which he allegedly proceeded to threaten the three with a stick.
Poorman was placed under arrest without incident and taken to a local hospital for evaluation and faces multple charges.
He will be arraigned when medically practical, police.