A chigger is a small biting insect and a sandchigger is one of same which lives in the desert. As for why I chose that as my screenname/nickname/internet identifier/thing-a-ma-jig... It all dates back to my freshman year of High School (so 1993). In the intro to computers class (which I couldn't just test out of...) one of our assignments was to make an e-mail address on one of the free providers (yahoo, msn, a handful of others which have since been eaten by yahoo and msn). But every name I chose was taken. So I just chose something at random from an episode of Ren and Stimpy (the one where they join the foreign legion, a guy in the background has a shirt that says "Kiss me, I don't have sand chiggers!") and surprisingly enough, noone had taken that. So it's been me ever since.