I'm a PHP Dev, but to non-tech's i say Web Developer, they often come back with "Oh so you design websites?", to which i say no, since i cant design for shit.

I always explain it as, theres a pretty part of the website that everyone sees and the clever bit of the website that no one sees, i do the clever bit. Which usually satisfies their curiosity, since they then probably think its very boring, which i suppose it is to them.

Without fail though, pretty much everyone assumes i can fix their printer etc...