<p><strong>Noun</strong></p><ul><li>a person or thing that flashes.</li><li>a flashing flashlight operated by a switching device that automatically turns it on and off alternately.</li><li>a signal light on an automotive vehicle that can be made to flash, as to indicate the intention of making a turn or to call attention to a vehicle that has slowed or stopped in a hazardous place.</li><li>Compare: turn signal.</li><li>the switching device that operates such a light.</li><li>Slang: a person, especially a man, who exposes the genitals suddenly, and usually briefly, in public.</li></ul>