In the 1980s they were called "punk". Same thing as emo. Emo is not a new thing, but the word emo is new. If you know what "punks" were in the 80s and how they dressed and acted, well, that is what an emo is in 2011. Same thing different label.
If the punk kid in 1985 was sent forward in a time machine to the year 2011 they would call him an Emo.