A nerfherder was someone who herded nerfs on various planets throughout the galaxy. As it was solely an occupation for lower-class beings, the term "nerfherder" became an insult used throughout the galaxy
I knew she was into me when I told her the base movement rate of a hill dwarf. She even let me wash her car before she sent me home. She called me her little nerdherder....whatever that is.
An insult that is so lame that it actually backfires on the insulter by insulting his/her intelligence. The original nerfherder was told by Princess Leah in Star Wars: the Empire Strikes Back.