flasher

noun

1. someone with a compulsive desire to expose the genitals

Similar word(s): exhibitionist

Definition categories: person, compulsive

2. an electrical device that automatically turns a lamp on and off (as for an advertising display)

Definition categories: man–made

3. a light that flashes on and off; used as a signal or to send messages

Similar word(s): blinker

Definition categories: man–made, light