Bowscrew is a simple name given to the little screw that holds the "bow" on to the rest of the pair of eyeglasses.

Myself (Eric) and my fellow creator (Brandon) use this word to describe a person who is a "TOOL", except we take it to another level. What "tool" is the most useless of all the tools? how about the little screw that..... you get the point. even if it weren't there... the glasses would work just fine!