Like a lot of descriptive words, it's a poorly chosen one. Emo is short for emotional, which isnt' that what music is suppsoed to be? Considering the bands who are usually pointed at as originators of the style are bands liek Rites of Spring and date back to 1985 or 86, teh current Emo scene is really pathetic and the name means even less now than then. You can find a vid on youtube of Ian Mackaye (Fugazi, Minor Threat) telling people not to use Emo as a descriptiev term. Back in 86 or 87.