What does "flasher" mean?

Anything that flashes, especially a device that switches a light on and off.

What is a synonym for "flasher"?

Common synonyms include: exhibitionist, exhibitionist, blinker, blinker, lamp, light source.

//ˈflæʃɚ// name, noun, slang

name, noun, slang ·Moderate ·College level

Noun

1
Anything that flashes, especially a device that switches a light on and off.
2
A software developer who uses the Flash multimedia technology. informal
"JavaScript is an appealing solution for Flashers because it operates in the same client-side environment […]"
3
a light that flashes on and off; used as a signal or to send messages wordnet
4
An indicator or turn signal.
"Look here, look at this fire truck! It has flashers and sirens, and if you push the button at the bottom, it moves by itself."
5
an electrical device that automatically turns a lamp on and off (as for an advertising display) wordnet

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6
Someone of great accomplishments, or brilliant appearance. obsolete
"Mr Yorke of D'Affrenalli has been introduced to me as a Wit & a Flasher: it was supposed that we were to admire one another's Abilities,—but I fancy the Project failed on both Sides […]."
7
someone with a compulsive desire to expose the genitals wordnet
8
Someone who exposes themselves indecently; someone who ‘flashes’ their genitals. slang