A noun, trekkers are originally fans of the TV show Star Trek: the Next Generation, and used the term 'trekker' to differentiate themselves from the original star trek fans who called themselves 'trekkies' Trekker has now come to mean a Trekkie who doesn't understand that they're a trekkie. Within the star trek community, there is still a debate over the difference between trekkies and trekkers, but the only difference is that trekkies came first, and trekkers don't like the term 'trekkie'.