Actually, this is a word I picked up from Reno.
"Dork-light" is the affectionate term referring to the low-profile LED flashlights that clip directly on to the bill of a gimme hat, thus allowing for hands-free use.
They are incredibly useful, small, out of the way and provide a decent amount of useful light. I hope that the inventor of these little gadgets made a bloody fortune.
However, despite the incredible utility of these lights -- and, trust me, I wouldn't trade mine for all the tea in China -- I have the feeling I look a bit of a dork when I clip it to my hat brim. Thus, the name.