Somebody who is really addicted to flashlights.
A typical flashaholic might have dozens of them; hardcore flashaholics might have hundreds or (in one documented case) close to 1,500 of the bright little suckers!!!
The word was coined a number of years ago on a BBS about flashlights.
Did you hear that Craig is a true flashaholic, with 1,497 flashlights, lasers, and other assorted things that flash, blink, or otherwise emit EM radiation in the range of 380nm to 780nm?
What a kick in the head!!!