flasher
noun /ˈflæʃə(r)/
/ˈflæʃər/
- (informal) a man who shows his sexual organs in public, especially in order to shock or frighten womenTopics Crime and punishmentc2
- a device that turns a light on and off quickly
- (North American English) a light on a vehicle that you can turn on and off quickly as a signal
- four-way flashers (= four lights that flash together to warn other drivers of possible danger)